CREST is excited to welcome three new researchers who arrived in January 2025. Each brings unique expertise and a strong academic background, further strengthening our multidisciplinary research environment.
Jean-François Chassagneux
Position: Full Professor in Mathematics (ENSAE Paris)
Research Interests: : Mathematical finance & numerical probability: partial hedging and non-linear pricing, quantitative methods for transition risks and carbon markets, switching problems and reflected BSDEs, numerical methods for mean-field systems.
Previous Position: Full Professor in Applied Mathematics, Université Paris Cité & LPSM
Learn More: Jean-François Chassagneux’s personal webpage
Javier Gonzalez-Delgado
Position: Assistant Professor in Statistics (ENSAI)
Research Interests: Selective inference, hypothesis testing, clustering, and statistical methods for real-world problems in biology, particularly structural biology and genetics.
Previous Position: Postdoctoral researcher, Human Genetics, McGill University
Learn More: Javier Gonzalez-Delgado’s personal webpage
“After a period away from here, I am looking forward to reconnect with the French research community and develop new connections with scientists at CREST!”
Mohammadreza Mousavi Kalan
Position: Assistant Professor in Statistics (ENSAI)
Research Interests: Statistical machine learning, Transfer learning, Domain adaptation, Outlier detection, Optimization Theory, Distrusted Computing.
Previous Position: Postdoctoral researcher, Columbia University
“I am excited to join CREST as an Assistant Professor. CREST’s excellent research reputation makes it the perfect place to continue my academic journey. With renowned researchers at CREST, this opens up amazing opportunities for meaningful collaborations that will let me contribute to and grow with this vibrant community. I look forward to impactful research and close collaboration with such inspiring colleagues.”
We are delighted to welcome Jean-François, Javier, and Mohammadreza to the CREST. Their expertise and dedication to advancing research will undoubtedly contribute to the lab’s excellence. Stay tuned for updates on their research and collaborations!
Etienne Ollion, sociologue : « La fin de l’interdiction du cumul des mandats serait le dernier clou dans le cercueil du “renouvellement de la vie politique” »
Interview d’Etienne Ollion pour le journal Le Monde
16/01/2025
Pauline Rossi : “Pourquoi fait-on moins d’enfants ?” pour The Conversation
Michelangelo Rossi: How Top Reviewers Skew Online Ratings
Michelangelo Rossi published a new paper on consumer behavior in Harvard Business Review.
Comprendre comment les ménages réagissent à la perte d’un emploi : un éclairage à partir des travaux de Lionel Wilner
Lionel Wilner, chercheur au CREST et enseignant à l’ENSAE Paris, s’est intéressé aux épisodes de chômage dans une récente étude INSEE co-écrite avec Odran Bonnet (INSEE), François Le Grand (Rennes School of Business), Tom Olivia (INSEE) et Xavier Ragot (Sciences Po, CNRS, OFCE) intitulée The Consumption Response to Unemployment: Evidence from French Bank Account Data. Ce document de travail explore comment les ménages réagissent à la perte d’un emploi, sur le plan financier, en analysant des données bancaires portant sur plus de 6 500 foyers percevant des indemnités chômage.
Une méthodologie novatrice
Cette recherche, qui s’appuie sur des données à haute fréquence issues de comptes bancaires, examine comment les ménages ajustent leurs dépenses et utilisent leur épargne pour faire face à un choc de chômage. Les résultats montrent que sur les six premiers mois suivant une perte d’emploi, 36 % de la baisse de revenu est compensée par une réduction des dépenses, tandis que le reste est principalement comblé par la mobilisation de l’épargne liquide.
Retombée dans la presse et perspectives pour les politiques publiques
Ces travaux apportent un éclairage sur les marges d’adaptation des ménages et ont des implications sur la conception d’une assurance chômage optimale. L’étude a récemment été mise en lumière par Les Échos (édition du 9 janvier 2025), qui souligne son importance pour comprendre les arbitrages des ménages face à une perte de revenu.  En quantifiant la propension marginale à consommer en période de chômage (0,36) et ses variations selon la liquidité des ménages notamment, cette étude contribue aux débats sur des réformes possibles de l’assurance chômage.
Comprendre comment les ménages réagissent à la perte d’un emploi : un éclairage à partir des travaux de Lionel Wilner
Lionel Wilner, chercheur au CREST et enseignant à l’ENSAE Paris, s’est intéressé aux épisodes de chômage dans une récente étude INSEE co-écrite avec Odran Bonnet (INSEE), François Le Grand (Rennes School of Business), Tom Olivia (INSEE) et Xavier Ragot (Sciences Po, CNRS, OFCE) intitulée The Consumption Response to Unemployment: Evidence from French Bank Account Data. Ce document de travail explore comment les ménages réagissent à la perte d’un emploi, sur le plan financier, en analysant des données bancaires portant sur plus de 6 500 foyers percevant des indemnités chômage.
Une méthodologie novatrice
Cette recherche, qui s’appuie sur des données à haute fréquence issues de comptes bancaires, examine comment les ménages ajustent leurs dépenses et utilisent leur épargne pour faire face à un choc de chômage. Les résultats montrent que sur les six premiers mois suivant une perte d’emploi, 36 % de la baisse de revenu est compensée par une réduction des dépenses, tandis que le reste est principalement comblé par la mobilisation de l’épargne liquide.
Retombée dans la presse et perspectives pour les politiques publiques
Ces travaux apportent un éclairage sur les marges d’adaptation des ménages et ont des implications sur la conception d’une assurance chômage optimale. L’étude a récemment été mise en lumière par Les Échos (édition du 9 janvier 2025), qui souligne son importance pour comprendre les arbitrages des ménages face à une perte de revenu.  En quantifiant la propension marginale à consommer en période de chômage (0,36) et ses variations selon la liquidité des ménages notamment, cette étude contribue aux débats sur des réformes possibles de l’assurance chômage.
Une tribune d’Olivier Lopez et Pierre Vaysse pour le journal Les Echos
Une tribune d’Olivier Lopez et Pierre Vaysse pour le journal Les Echos
6 janv. 2025
Une tribune d’Olivier Lopez et Pierre Vaysse pour le journal Les Echos
Une tribune d’Olivier Lopez et Pierre Vaysse pour le journal Les Echos
6 janv. 2025
2024 CREST Highlights
As 2024 draws to a close, CREST reflects on a year filled with groundbreaking research, prestigious awards, and impactful initiatives. Here’s a look back at our key achievements.
đź“Š Research Breakthroughs: 93 Articles Published
CREST published 93 articles so far, with 62% appearing in Q1 journals. These works reflect the breadth and depth of research conducted across CREST’s clusters. Here are some highlights:
Information Technology and Returns to Scale by Danial Lashkari, Arthur Bauer, and Jocely Boussard explores how technological advancements influence economies of scale, shedding light on contemporary production practices, in American Economic Review
Locus of Control and the Preference for Agency by Marco Caliendo, Deborah Cobb-Clark, Juliana Silva-Goncalves, and Arne Uhlendorff investigates how personal traits shape individuals’ economic decisions, providing a deeper understanding of agency in economic behavior, in European Economic Review.
Global Mobile Inventors by Dany Bahar, Prithwiraj Choudhury, Ernest Miguelez, and Sara Signorelli examines the migration patterns of innovative talent worldwide, offering new perspectives on innovation dynamics, in Journal of Development Economics.
Testing and Relaxing the Exclusion Restriction in the Control Function Approach by Xavier D’Haultfoeuille, Stefan Hordelein, and Yuya Sasaki provides advanced methodologies to enhance econometric analysis, in Journal of Econometrics.
Are Economists’ Preferences Psychologists’ Personality Traits? A Structural Approach by Tomas Jagelka bridges economics and psychology, exploring how personality traits influence economic preferences, in Journal of Political Economy.
Autoregressive Conditional Betas by Francisco Blasques, Christian Francq, and SĂ©bastien Laurent provides innovative methods to measure financial risk, critical for investment strategies, in Journal of Econometrics.
Model-based vs. Agnostic Methods for the Prediction of Time-Varying Covariance Matrices by Jean-David Fermanian, Benjamin Poignard, and Panos Xidonas compares methodologies for improving financial predictions under uncertainty, in Annals of Operations Research.
Corporate Debt Value Under Transition Scenario Uncertainty by Theo Le Guedenal and Peter Tankov addresses the valuation of corporate debt amid environmental and regulatory changes, in Mathematical Finance.
Semiparametric Copula Models Applied to the Decomposition of Claim Amounts by SĂ©bastien Farkas and Olivier Lopez develops new actuarial techniques to better understand insurance claims, in Scandinavian Actuarial Journal.
On the Chaotic Expansion for Counting Processes by Caroline Hillairet and Anthony RĂ©veillac advances mathematical models with applications in finance and beyond, in Electronic Journal of Probability.
Russia’s Invasion of Ukraine and Perceived Intergenerational Mobility in Europe by Alexi Gugushvili and Patrick Präg examines how geopolitical shocks affect societal perceptions and mobility, in British Journal of Sociology.
The Total Effect of Social Origins on Educational Attainment: Meta-analysis of Sibling Correlations From 18 Countries by Lewis R. Anderson, Patrick Präg, Evelina T. Akimova, and Christiaan Monden provides a meta-analysis of sibling correlations, offering fresh insights into education and inequality, in Demography.
Context Matters When Evacuating Large Cities: Shifting the Focus from Individual Characteristics to Location and Social Vulnerability by Samuel Rufat, Emeline Comby, Serge Lhomme, and Victor Santoni shifts the focus from individual characteristics to social vulnerabilities during urban evacuations, in Environmental Science and Policy.
Gender Equality for Whom? The Changing College Education Gradients of the Division of Paid Work and Housework Among US Couples, 1968-2019 by LĂ©a Pessin explores shifting dynamics in gendered divisions of labor among U.S. couples over the decades, in Social Forces.
The Augmented Social Scientist: Using Sequential Transfer Learning to Annotate Millions of Texts with Human-Level Accuracy by Salomé Do, Etienne Ollion, and Rubing Shen highlights how AI tools can assist in large-scale sociological research with human-level accuracy, in Sociological Methods and Research.
Investigating Swimming Technical Skills by a Double Partition Clustering of Multivariate Functional Data Allowing for Dimension Selection, by Antoine Bouvet, Salima El Kolei, Matthieu Marbac, in Annals of Applied Statistics.
Full-model estimation for non-parametric multivariate finite mixture models, by Marie Du Roy de Chaumaray, Matthieu Marbac, in Journal of the Royal Statistical Society. Series B: Statistical Methodology
Tail Inverse Regression: Dimension Reduction for Prediction of Extremes, by Anass Aghbalou, François Portier, Anne Sabourin, Chen Zhou, in Bernoulli.
Proxy-analysis of the genetics of cognitive decline in Parkinson’s disease through polygenic scores, by Johann Faouzi, Manuela Tan, Fanny Casse, Suzanne Lesage, Christelle Tesson, Alexis Brice, Graziella Mangone, Louise-Laure Mariani, Hirotaka Iwaki, Olivier Colliot, Lasse Pihlstrom, Jean-Christophe Corvol, in NPJ Parkinson’s Disease.
Benign Overfitting and Adaptive Nonparametric Regression, by Julien Chhor, Suzanne Sigalla, Alexandre Tsybakov, in Probability Theory and Related Fields.
🎯 Discover more CREST publications on our HAL webpage.
🌍 Impactful Events and Conferences
CREST actively participated in and hosted events that fostered collaboration and knowledge exchange:
- European Parliament Panel: Sociologist Paola Tubaro led a pivotal discussion on alternatives to platform-driven gig economies, bringing sociological insights to policy discussions.
- Publication by the National Courts of Audit: Barometer of Fiscal and Social Contributions in France – Second Edition 2023.
- NeurIPS 2024: CREST had a strong presence with 19 papers selected, showcasing cutting-edge work in artificial intelligence and neural information processing.
- Cyber-Risk Conference Cyr2fi: Co-organized with École Polytechnique, this event highlighted the interdisciplinary approaches needed to address growing cybersecurity threats.
- Nobel Prize Lecture: Researchers and PhDs of IP Paris Economics Department celebrated the 2023 Nobel Prize in Economics, reinforcing academic excellence.
đź“… Join future events: Visit our calendar.
2024 brought two new chairs at CREST:
- Cyclomob by Marion Leroutier highlights research into sustainable urban mobility, funded through a regional chair.
- Impact Investing Chair by Olivier-David Zerbib to maximize the positive impact of the investment on the environment and society.
🏆 Awards and Recognitions
2024 was a year of accolades for CREST:
- 5 ERC Grants for CREST in 2024: Yves Le Yaouanq has recently joined the 2024 group of ERC grantees, which already includes Samuel Rufat, Olivier Gossner, Julien Combe, and Marion Goussé.
- CNRS Bronze Medal: Clément Malgouyres for contributions to labor economics.
- L’Oréal-UNESCO Young Talent: Solenne Gaucher recognized for her sustainable development work.
- EALE Young Labor Economist Prize: Federica Meluzzi for innovative labor market studies.
- 2024 AEJ Best Paper Awards in Macroeconomics: Giovanni Ricco wins the award for his paper “The transmission of Monetary Policy Shocks” with Silvia Miranda-Agrippino.
- Louis Bachelier Prize: Peter Tankov honored for achievements in mathematical finance.
In 2024, some CREST researchers were also appointed in diverse institutions:
- The Economic Journal: Roland Rathelot was appointed Managing Editor.
- The Econometric Society: Olivier Gossner was named Fellow of the Econometric Society.
- French Ministry of Economics: Franck Malherbet appointed as a member of the Expert Group on the Minimum Growth Wage.
đź“š Books and Projects
This year, CREST researchers authored several impactful books:
- Ce qui échappe à l’intelligence artificielle, edited by François Levin and Étienne Ollion, critically examines the limits of AI in understanding human complexity.
- Peut-on ĂŞtre heureux de payer des impĂ´ts ? by Pierre Boyer engages readers in a thought-provoking discussion on the role of taxation in society.
- Introduction aux Sciences Économiques, cours de première annĂ©e Ă l’Ecole polytechnique by Olivier Gossner et al. serves as an accessible entry point for students into economic principles.
- Une Ă©trange victoire, l’extrĂŞme droite contre la politique by MichaĂ«l Foessel and Étienne Ollion explores the relationship between politics and far-right ideologies.
2024 was also marked by the second series of the Beyond the PhD series, a series of videos dedicated to the PhD course. In 2024, we were able to explore the evolution of the PhD definition through students currently in different years of their studies in all CREST research clusters.
đź“Ł Media and Outreach
CREST researchers were featured in:
- 80+ media outlets, including Le Monde, Le Nouvel Obs, Les Échos, University World News, BBC News Brazil, France Culture, Libération, Le Cercles des Économistes, Médiapart, AOC…
- 30+ op-eds and articles, shaping public discourse.
🎙️ Featured Interview: Pauline Rossi discusses economic inequalities in Le Cercle des Économistes. Listen here.
CREST celebrates a year of remarkable achievements and meaningful contributions to research, society, and global conversations. From groundbreaking publications to prestigious awards and impactful events, our community has continued to push boundaries and inspire innovation.
Looking ahead to 2025, we remain committed to fostering interdisciplinary research, addressing societal challenges, and nurturing a collaborative environment for researchers and students.
2024 CREST Highlights
As 2024 draws to a close, CREST reflects on a year filled with groundbreaking research, prestigious awards, and impactful initiatives. Here’s a look back at our key achievements.
đź“Š Research Breakthroughs: 93 Articles Published
CREST published 93 articles so far, with 62% appearing in Q1 journals. These works reflect the breadth and depth of research conducted across CREST’s clusters. Here are some highlights:
Information Technology and Returns to Scale by Danial Lashkari, Arthur Bauer, and Jocely Boussard explores how technological advancements influence economies of scale, shedding light on contemporary production practices, in American Economic Review
Locus of Control and the Preference for Agency by Marco Caliendo, Deborah Cobb-Clark, Juliana Silva-Goncalves, and Arne Uhlendorff investigates how personal traits shape individuals’ economic decisions, providing a deeper understanding of agency in economic behavior, in European Economic Review.
Global Mobile Inventors by Dany Bahar, Prithwiraj Choudhury, Ernest Miguelez, and Sara Signorelli examines the migration patterns of innovative talent worldwide, offering new perspectives on innovation dynamics, in Journal of Development Economics.
Testing and Relaxing the Exclusion Restriction in the Control Function Approach by Xavier D’Haultfoeuille, Stefan Hordelein, and Yuya Sasaki provides advanced methodologies to enhance econometric analysis, in Journal of Econometrics.
Are Economists’ Preferences Psychologists’ Personality Traits? A Structural Approach by Tomas Jagelka bridges economics and psychology, exploring how personality traits influence economic preferences, in Journal of Political Economy.
Autoregressive Conditional Betas by Francisco Blasques, Christian Francq, and SĂ©bastien Laurent provides innovative methods to measure financial risk, critical for investment strategies, in Journal of Econometrics.
Model-based vs. Agnostic Methods for the Prediction of Time-Varying Covariance Matrices by Jean-David Fermanian, Benjamin Poignard, and Panos Xidonas compares methodologies for improving financial predictions under uncertainty, in Annals of Operations Research.
Corporate Debt Value Under Transition Scenario Uncertainty by Theo Le Guedenal and Peter Tankov addresses the valuation of corporate debt amid environmental and regulatory changes, in Mathematical Finance.
Semiparametric Copula Models Applied to the Decomposition of Claim Amounts by SĂ©bastien Farkas and Olivier Lopez develops new actuarial techniques to better understand insurance claims, in Scandinavian Actuarial Journal.
On the Chaotic Expansion for Counting Processes by Caroline Hillairet and Anthony RĂ©veillac advances mathematical models with applications in finance and beyond, in Electronic Journal of Probability.
Russia’s Invasion of Ukraine and Perceived Intergenerational Mobility in Europe by Alexi Gugushvili and Patrick Präg examines how geopolitical shocks affect societal perceptions and mobility, in British Journal of Sociology.
The Total Effect of Social Origins on Educational Attainment: Meta-analysis of Sibling Correlations From 18 Countries by Lewis R. Anderson, Patrick Präg, Evelina T. Akimova, and Christiaan Monden provides a meta-analysis of sibling correlations, offering fresh insights into education and inequality, in Demography.
Context Matters When Evacuating Large Cities: Shifting the Focus from Individual Characteristics to Location and Social Vulnerability by Samuel Rufat, Emeline Comby, Serge Lhomme, and Victor Santoni shifts the focus from individual characteristics to social vulnerabilities during urban evacuations, in Environmental Science and Policy.
Gender Equality for Whom? The Changing College Education Gradients of the Division of Paid Work and Housework Among US Couples, 1968-2019 by LĂ©a Pessin explores shifting dynamics in gendered divisions of labor among U.S. couples over the decades, in Social Forces.
The Augmented Social Scientist: Using Sequential Transfer Learning to Annotate Millions of Texts with Human-Level Accuracy by Salomé Do, Etienne Ollion, and Rubing Shen highlights how AI tools can assist in large-scale sociological research with human-level accuracy, in Sociological Methods and Research.
Investigating Swimming Technical Skills by a Double Partition Clustering of Multivariate Functional Data Allowing for Dimension Selection, by Antoine Bouvet, Salima El Kolei, Matthieu Marbac, in Annals of Applied Statistics.
Full-model estimation for non-parametric multivariate finite mixture models, by Marie Du Roy de Chaumaray, Matthieu Marbac, in Journal of the Royal Statistical Society. Series B: Statistical Methodology
Tail Inverse Regression: Dimension Reduction for Prediction of Extremes, by Anass Aghbalou, François Portier, Anne Sabourin, Chen Zhou, in Bernoulli.
Proxy-analysis of the genetics of cognitive decline in Parkinson’s disease through polygenic scores, by Johann Faouzi, Manuela Tan, Fanny Casse, Suzanne Lesage, Christelle Tesson, Alexis Brice, Graziella Mangone, Louise-Laure Mariani, Hirotaka Iwaki, Olivier Colliot, Lasse Pihlstrom, Jean-Christophe Corvol, in NPJ Parkinson’s Disease.
Benign Overfitting and Adaptive Nonparametric Regression, by Julien Chhor, Suzanne Sigalla, Alexandre Tsybakov, in Probability Theory and Related Fields.
🎯 Discover more CREST publications on our HAL webpage.
🌍 Impactful Events and Conferences
CREST actively participated in and hosted events that fostered collaboration and knowledge exchange:
- European Parliament Panel: Sociologist Paola Tubaro led a pivotal discussion on alternatives to platform-driven gig economies, bringing sociological insights to policy discussions.
- Publication by the National Courts of Audit: Barometer of Fiscal and Social Contributions in France – Second Edition 2023.
- NeurIPS 2024: CREST had a strong presence with 19 papers selected, showcasing cutting-edge work in artificial intelligence and neural information processing.
- Cyber-Risk Conference Cyr2fi: Co-organized with École Polytechnique, this event highlighted the interdisciplinary approaches needed to address growing cybersecurity threats.
- Nobel Prize Lecture: Researchers and PhDs of IP Paris Economics Department celebrated the 2023 Nobel Prize in Economics, reinforcing academic excellence.
đź“… Join future events: Visit our calendar.
2024 brought two new chairs at CREST:
- Cyclomob by Marion Leroutier highlights research into sustainable urban mobility, funded through a regional chair.
- Impact Investing Chair by Olivier-David Zerbib to maximize the positive impact of the investment on the environment and society.
🏆 Awards and Recognitions
2024 was a year of accolades for CREST:
- 5 ERC Grants for CREST in 2024: Yves Le Yaouanq has recently joined the 2024 group of ERC grantees, which already includes Samuel Rufat, Olivier Gossner, Julien Combe, and Marion Goussé.
- CNRS Bronze Medal: Clément Malgouyres for contributions to labor economics.
- L’Oréal-UNESCO Young Talent: Solenne Gaucher recognized for her sustainable development work.
- EALE Young Labor Economist Prize: Federica Meluzzi for innovative labor market studies.
- 2024 AEJ Best Paper Awards in Macroeconomics: Giovanni Ricco wins the award for his paper “The transmission of Monetary Policy Shocks” with Silvia Miranda-Agrippino.
- Louis Bachelier Prize: Peter Tankov honored for achievements in mathematical finance.
In 2024, some CREST researchers were also appointed in diverse institutions:
- The Economic Journal: Roland Rathelot was appointed Managing Editor.
- The Econometric Society: Olivier Gossner was named Fellow of the Econometric Society.
- French Ministry of Economics: Franck Malherbet appointed as a member of the Expert Group on the Minimum Growth Wage.
đź“š Books and Projects
This year, CREST researchers authored several impactful books:
- Ce qui échappe à l’intelligence artificielle, edited by François Levin and Étienne Ollion, critically examines the limits of AI in understanding human complexity.
- Peut-on ĂŞtre heureux de payer des impĂ´ts ? by Pierre Boyer engages readers in a thought-provoking discussion on the role of taxation in society.
- Introduction aux Sciences Économiques, cours de première annĂ©e Ă l’Ecole polytechnique by Olivier Gossner et al. serves as an accessible entry point for students into economic principles.
- Une Ă©trange victoire, l’extrĂŞme droite contre la politique by MichaĂ«l Foessel and Étienne Ollion explores the relationship between politics and far-right ideologies.
2024 was also marked by the second series of the Beyond the PhD series, a series of videos dedicated to the PhD course. In 2024, we were able to explore the evolution of the PhD definition through students currently in different years of their studies in all CREST research clusters.
đź“Ł Media and Outreach
CREST researchers were featured in:
- 80+ media outlets, including Le Monde, Le Nouvel Obs, Les Échos, University World News, BBC News Brazil, France Culture, Libération, Le Cercles des Économistes, Médiapart, AOC…
- 30+ op-eds and articles, shaping public discourse.
🎙️ Featured Interview: Pauline Rossi discusses economic inequalities in Le Cercle des Économistes. Listen here.
CREST celebrates a year of remarkable achievements and meaningful contributions to research, society, and global conversations. From groundbreaking publications to prestigious awards and impactful events, our community has continued to push boundaries and inspire innovation.
Looking ahead to 2025, we remain committed to fostering interdisciplinary research, addressing societal challenges, and nurturing a collaborative environment for researchers and students.