Étienne Ollion invited to discuss France’s political moment in European media


As France experiences a new wave of political turbulence, Étienne Ollion, sociologist at CREST-CNRS and École Polytechnique, has been invited by several major European media outlets to help make sense of the current situation.

Over the past week, he has shared his insights on Radio France’s Questions du Soir, Austria’s Ö1 – Europa JournalDenik N in the Czechia, and Politiken, one of Denmark’s leading newspapers. All of them turned to him to better understand how French institutions and public opinion are reacting to the latest government resdhuffle and budget debates.

Throughout these interviews, Étienne Ollion offers a sociologist’s perspective on the moment: how political uncertainty connects to deeper transformations in the evolution of party systems, and how current responses are out of sync with citizens’ expectations of public action.

He notes that France’s tripolar political landscape, divided between the presidential camp, the left, and the far right, has made coalition-building and compromise increasingly difficult in Parliament.

On Ö1 – Europa Journal, Austria’s leading public radio channel for culture and information, he explained that the rapid turnover of governments reflects not only political tensions but also “a deeper transformation of democratic life, where citizens expect more responsiveness and clarity from public action, and a wider role in the making of the nation”.

In Denik N, he pointed to growing frustration across social groups and a steady decline in confidence toward political representatives. And on France Culture, during a debate asking “Can France still be governed?”, he discussed the ways out of the political stalemate.

In Politiken, he provided international readers with context on how France’s political structures and social expectations interact in this volatile moment.

These interventions are closely linked to Étienne Ollion’s research on political representation and the evolution of elites. In his book The Candidates (Oxford Press, 2024), he studied how newcomers to politics navigate institutions and hierarchies, shedding light on the renewal and professionalization of political life. His more recent work, Une étrange victoire. L’extrême droite contre la politique (Seuil, 2024, with Michaël Foessel), explores the underpinnings of the rise of the far-right, between the growing opposition to democratic representation, a changing media landscape, and the new communication strategy of its main party, the National Rally.

At CREST, he develops research using computational methods to analyse public debate and political representation. This mix of empirical study, institutional knowledge, and data-driven analysis makes him a valuable voice for understanding the forces currently reshaping French democracy.

“GP Explorer 3 n’est pas une course qui sort de nulle part” : comment Twitch est devenue la nouvelle plateforme du sport spectacle


Dans l’article, Samuel Coavoux apporte un éclairage précieux sur le tournant stratégique que représente Twitch pour le spectacle sportif, en soulignant notamment comment la plateforme transforme la diffusion d’événements comme le GP Explorer en “nouveau front” de convergence entre sport, médias numériques et engagement des communautés.

03/10/2025

A New Academic Year, New Faces at CREST


Every year, CREST welcomes a new cohort of researchers who bring fresh perspectives, curiosity, and energy to our community. This fall, we are pleased to host new researchers, postdoctoral fellow, PhD students, and visiting researchers from around the world.

Their arrival marks an important moment in the life of our lab: the opportunity to grow, to renew dialogues across disciplines, and to continue building a vibrant and diverse research environment. Whether they join us for a few months or several years, these newcomers contribute to the intellectual richness and collaborative spirit that define CREST.

We are pleased to introduce the researchers who are joining CREST this year, each bringing their unique background and expertise to our four research areas: economics, sociology, statistics, and finance-insurance.

Researchers

This year, several new researchers are joining CREST, strengthening our core faculty and bringing new perspectives across ou disciplines.

Philippe Coulangeon is a CNRS Research Director, affiliated with the Centre for Research on Social Inequalities (CRIS) at SciencesPo Paris.

His work is set at the intersection of cultural sociology and social inequalities. He explores the stratification of cultural practices and tastes, the dynamics of mass versus elite culture, artistic professions, and the democratization of culture. More recently, he has integrated environmental concerns into his analysis.

More information here.

Fanny Landaud is a CNRS researcher from CY Cergy Paris University and she is an IZA Research Fellow since 2019.

Her research covers applied microeconomics – particularly labor, education, family, and health economics – with a focus on the determinants and consequences of socioeconomic and gender inequalities in education and the labor market.

More information here.

Antonio Ocello was a Postdoctoral Researcher in Statistics and Machine Learning at École polytechnique (CMAP) since 2023.

His research focuses on mean-field games and mean-field control problems, branching diffusion processes, and stochastic optimal control, combining advanced probabilistic methods with applications in machine learning. He has contributed to work on convergence bounds for trust-region policy optimization in mean-field games and is developing stochastic target frameworks for branching processes.

More information here.

Enrico Ruolino was a Senior Researcher at the University of Lausanne.

His work focuses on public and labor economics, with a particular emphasis on behavioral responses to tax policy, gender inequality, intergenerational mobility, and educational outcomes.

More information here.

Clémentine Van Effenterre was previously an Assistant Professor of Economics at the University of Toronto.

Her research lies at the intersection of labor economics, applied microeconomics, and political economy. Notably, she investigates how norms, institutions, and policies shape labor market outcomes – examining issues like maternal labor supply, gender gaps in science and tech, and how having daughters influences political attitudes. She also hosts the “InequaliTalks” podcast on economics and inequality.

More information here.

Postdoctoral Fellows

Our new postdoctoral researchers are contributing to ongoing projects and launching their own work in close collaboration with CREST teams.

Stéphane Lhaut, in the Finance-Insurance team, with Caroline Hillairet and Olivier Lopez.

Angelica Martinez-Leyva, in the Economics cluster at CREST-ENSAI, with Marion Goussé

Andrea Pandolfi, in Statistics, with Nicolas Chopin

Arthur Stephanovitch, in Statistics, with Austin Stromme

Lishu Zhang, in the Finance-Insurance team, with Olivier-David Zerbib

PhD Students

This year, we welcome a new cohort of PhD students who are beginning their research journeys within our vibrant academic community.

30 new PhD students are joining our laboratory in our different research clusters.

9 PhD students will join our Economic team, 7 in the Finance-Insurance cluster, 12 new PhD students in Statistics, and 2 in our Sociology team.

4 of them will join our lab on the CREST-ENSAI campus in Bruz while the remaining PhD students will join our CREST-ENSAE Paris campus in Palaiseau.

This new team will also be joined by 3 PhD students in ATER contracts in the CREST-ENSAI campus.

Visiting Researchers

CREST is also hosting several visiting researchers this year, joining us for research stays that foster international collaboration.

Yang Chen (Lausanne University, Switzerland) is joining our Economic team to work with Julien Combe on Microeconomic theory and matching theory.

Matias Ortiz (Universidad de Chile, Chile) will work with Vianney Perchet on Learning-Augmented Online Algorithms for Matroid-Constrained problems under Partial in our Statistical team.

Simon Luck (Universita di Bologna, Italy) is joining Etienne Ollion’s team in Sociology to work on using natural language processing to study the relevance of the news media for political representation and decision-making processes.

Jules Verin (ENS Lyon, France) will work with Bertrand Garbinti in Economics on Wealth Accumulation, Life Cycle, and Taxation.

Väinö Yrjänäinen (Uppsala University, Sweden) is joining the Sociology team with Etienne Ollion to work on using work embeddings and transformer models in computational social sciences.

Micro-travail et discriminations : quand la recherche éclaire le droit


Le 26 mai 2025, la Défenseure des droits a rendu une décision (n°2025-086) concernant les travailleurs et travailleuses de la plateforme de micro-travail française. Cette décision s’appuie largement sur les résultats d’un travail de recherche mené par Paola Tubaro (CNRS-CREST), Antonio Casilli (Télécom Paris) et Juana Torres-Cierpe (Inria), dans le cadre du programme DiPLab.

Lien vers la décision : Décision n°2025-086 – Défenseur des droits

Un travail collectif pour mieux comprendre et faire reconnaître les discriminations

Pendant plusieurs années, l’équipe de recherche a enquêté sur les conditions de travail dans le micro-travail : « Il s’agit de petites tâches effectuées en ligne, souvent rémunérées de manière minimale : classification d’images, transcription de textes, traduction […] principalement utilisées pour alimenter des algorithmes et des solutions d’intelligence artificielle ».

Leur rapport met en lumière des réalités peu visibles :

  • Des conditions souvent précaires,
  • Des travailleurs et travailleuses exposés à des formes de discrimination (par l’algorithme, par les clients, ou par la plateforme elle-même),
  • Une majorité de femmes, souvent en situation de grande vulnérabilité économique et sociale.

Dans le cas étudié, les règles d’accès à la plateforme excluaient certains profils, notamment en fonction du pays de résidence, ce qui soulève des questions importantes au regard du droit.

Une recherche à fort impact sociétal

Cette affaire montre que la recherche peut avoir un véritable impact hors du monde académique. Grâce à ce travail rigoureux et engagé, la Défenseure des droits a pu prendre une décision fondée, qui servira à mieux encadrer les pratiques des plateformes numériques, et à protéger celles et ceux qui y travaillent.

C’est aussi une belle reconnaissance pour Paola Tubaro, Antonio Casilli et Juana Torres-Cierpe, qui prouvent une fois encore que les sciences sociales ont un rôle essentiel à jouer dans les débats contemporains.

Paola Tubaro Sheds Light on the Invisible Workforce Behind AI at Buenos Aires’ “Nuit des Idées”


Paola Tubaro, CNRS Research Director at CREST, recently participated in the Nuit des Idées (Night of Ideas) held at the iconic Teatro Colón in Buenos Aires. This international event, organized by the Institut français d’Argentine and its partners, brings together thinkers, artists, and researchers to engage in public discussions on contemporary challenges.

During the event, Tubaro spoke about the often-overlooked human labor behind artificial intelligence systems. She emphasized the critical role of micro-workers who perform essential tasks such as data labeling and content moderation, enabling AI technologies to function effectively. Tubaro highlighted the precarious conditions these workers often face, including low wages, invisibility, and a lack of rights or recognition.

In a follow-up interview with Clarín, one of Argentina’s leading newspapers, she delved deeper into the topic. She described these workers as “neo-laborers of the algorithm,” performing countless “microtasks” for platforms like Amazon Mechanical Turk—often during their free time, with few protections and little public awareness of their role. Tubaro called for greater transparency, fairer conditions, and the ethical recognition of their contribution to technological progress.

Her reflections contribute to a broader understanding of the social and economic infrastructures behind AI systems, urging policymakers and the public to account for the real human costs behind digital automation.

Faut-il travailler avec ou contre l’IA ?


Paola Tubaro participe à l’émission Parlons-en de la chaîne France24 sur la thématique “Doit-on travailler avec ou contre l’intelligence artificielle ?” avec Jean Cattan, secrétaire général du Conseil national du numérique, Yann Lechelle, co-fondateur et directeur général de Probabl, spinoff d’Inria spécialisée dans les outils d’IA et de science de données pour les entreprises, et Caroline Fredrickson, Directrice du département de la recherche à l’OIT.

01/05/2025

La part du genre dans les sciences sociales


Dans une étude à paraître dans la revue Actes de la recherche en sciences sociales et chroniquée ce jour dans le journal Le Monde : “Il n’y a pas d’obsession pour le genre dans les sciences sociales en France : une vaste étude le démontre, Samuel Coavoux, Etienne Ollion et plusieurs collègues ont étudié la place donnée au genre dans les sciences sociales.

La question a un intérêt scientifique évident. Elle permet aussi de revisiter certains débats publics récents — par exemple sur la place du “wokisme” à l’université.

L’enquête est inédite dans son ampleur : les auteurs ont analysé l’ensemble des publications de sciences sociales françaises depuis 25 ans.

L’enquête est innovante aussi, elle utilise des outils récents d’intelligence artificielle, développés au sein de l’équipe de sciences sociales computationnelles du CREST.

Les résultats sont parlants, et parfois inattendus :

  • Le recours au genre comme grille d’analyse a augmenté au cours des 25 dernières années,
  • Certaines disciplines ont été pionnières (démographie, anthropologie, histoire, sociologie), d’autres s’y sont intéressées plus récemment (histoire, sciences de gestion)
  • Mais la mobilisation du genre est in fine limitée. Avec 12% du total des articles qui évoquent le genre, on est loin de l’invasion dénoncée par certains.
  • L’approche de genre est encore très majoritairement le fait de femme. Entre 2016 et 2022, 66 % des articles mobilisant cette perspective ont été écrits par des femmes ou une majorité de femmes, une proportion  stable dans le temps. L’augmentation du genre dans les publications pourrait bien être la conséquence de la féminisation des disciplines.

L’étude, la première au monde à analyser le genre dans les publications avec des outils d’intelligence artificielle, est disponible ici

La presse en parle :

Altaïr Despres : «La hausse des études sur le genre dans les sciences sociales reste très timide» – Libération

Beyond the PhD – CREST Series #3: Insights from PhD Supervisors


At CREST, we aim to showcase the diverse career trajectories and perspectives of researchers who have navigated the path beyond their PhD. The “Beyond the PhD” series provides an opportunity to hear directly from experts across different fields about their experiences, challenges, and insights on life as a researcher.

For this third installment, we are featuring four distinguished researchers: Benoit Schmutz (Ecole polytechnique, IP Paris), Caroline Hillairet (GENES, ENSAE Paris, IP Paris), Paola Tubaro (CNRS, ENSAE Paris, IP Paris), and Nicolas Chopin (GENES, ENSAE Paris, IP Paris). Each of them shares their thoughts on the PhD journey, its impact on their careers, and the broader role of research in society.

Why pursue a PhD at CREST?

A PhD is much more than just academic training—it’s about developing a mindset that allows you to explore complex questions, think critically, and push the boundaries of knowledge. Our researchers highlight three key aspects that define the PhD experience at CREST:

🔹 An Environment for Intellectual Growth – A PhD is a journey of constant learning. You will develop a structured way of thinking, gain expertise in your field, and learn how to navigate uncertainty in research.

🔹 Opportunities for Interdisciplinary Work – At CREST, you will interact with researchers across economics, sociology, finance, and statistics, allowing for a dynamic and stimulating research experience.

🔹 A Supportive and Collaborative Research Culture – While research can be challenging, you will not be alone. Engaging with peers, supervisors, and the broader academic community is essential, and at CREST, we value collaboration as much as independence.

Watch the introduction to this series below.

Meet the Researchers

Each researcher featured in this edition brings a unique perspective on the PhD experience and beyond.

Benoit SchmutzFrom PhD to Applied Economics

Benoit discusses how a PhD equips students with essential analytical skills, particularly in understanding labor markets and urban economics. He emphasizes the importance of rigor and adaptability in research.

🎥 Watch Benoit’s insights

Caroline HillairetMathematics, Finance, and Research Opportunities

Caroline shares her journey from mathematics to finance, highlighting how a PhD opens doors to interdisciplinary research and the application of theoretical models to real-world problems.

🎥 Watch Caroline’s insights

Paola TubaroNetworks, Society, and the Role of Research

Paola discusses how her research in computational social sciences evolved, emphasizing the collaborative nature of research and the impact of digital transformations on society.

🎥 Watch Paola’s insights

Nicolas ChopinThe Art of Asking the Right Questions

Nicolas talks about the role of uncertainty in research, how a PhD teaches resilience, and the impact of Bayesian statistics in various domains, including machine learning.

🎥 Watch Nicolas’s insights

Advice for Future PhD Students

If you are considering applying for a PhD at CREST, here are a few key takeaways from our researchers:

Stay curious – Research is about exploration, so embrace new ideas and unexpected results.
Engage with the academic community – Attend conferences, collaborate with other researchers, and actively participate in lab activities.
Be patient and persistent – Progress in research takes time. Learning how to overcome obstacles is part of the PhD experience.
Think beyond the thesis – Your PhD is not just about writing a dissertation; it’s about developing a way of thinking that will shape your career.

Check out our two previous series of Beyond the PhD on the CREST YouTube Channel:

Beyond the PhD – Series 1 – a video centered on the International Job Market from Economics PhD students.

Beyond the PhD – Series 2 – a series of videos from our PhD students on the definition of what is a PhD.