New faculty members introduce themselves - Graduate School of Mathematics
Dang Nguyen Bac
I am currently Maître de conférences in the Arithmetic and Algebraic geometry group. Previously I did my Phd with Charles Favre, then I was a postdoc at Stony Brook University under the supervision of Eric Bedford and Mikhail Lyubich.
I am interested in rational mappings and their dynamics which are defined on projective spaces of dimension larger or equal to 2. So far, I worked in algebraic dynamics, where one studies problems of algebraic nature that arise in holomorphic dynamical systems, and on applying ideas and insights from holomorphic dynamics to other topics.
I work in noncommutative geometry. My work is based around associating operator algebras to situations in differential geometry. The main goal of which is to study differential operators in singular situations like quotient spaces associated to group actions or foliations.
I defended my thesis in 2018 under the supervision of G. Skandalis. After my PhD, I did a two year postdoc in Muenster.
Since 2021, I have been a MCF in Paris-Saclay university.
Jiao He
My main area of interest is analysis of partial differential equations, especially in investigating the behavior of solutions of partial differential equations coming from fluid mechanics. More specifically, my current research focuses primarily on understanding the change in the fluid under the influence of other factors, for instance, a moving rigid body in the flows or a floating structure.
I finished my Ph.D In September 2019 in Institute Camille Jordan at the University Bernard Claude Lyon 1 under the supervise of Dragoş Iftimie and Lorenzo Brandolese. I then was a Post-doc researcher funded by the Programme Sophie Germain of FMJH in LaMME at the University of Evry from 2019 to 2021. Later on, I was a Postdoctoral Fellowship in the program "Mathematical problems in fluid dynamics" at MSRI, Berkeley, from January to May 2021.
Since September 2021, I have been a "maitre de conférences" (assistant professor) at Laboratoire de Mathématiques d'Orsay.
My research is concerned with holomorphic and arithmetic dynamical systems. More precisely, I study interactions between these two fields of research, using tools from pluripotential theory, complex analytic geometry, arithmetic geometry, combinatorics, and measure theory.
I defended my PhD Thesis in the Université Toulouse 3 Paul Sabatier under the direction of François Berteloot. I then was an ATER (temporary assistant professor) at the Université Toulouse 2 le Mirail. I then was Maître de Conférence at the Université de Picardie Jules Verne in amiens from 2012 to 2018, period during which I visited the Institute of Mathematical Studies at Stony Brook University, NY for a semester. I then was Professeur Monge at Ecole Polytechnique from 2018 to 2021.
Since September 2021, I am pleased to be a Professor at the Laboratoire de Mathématiques d’Orsay, at the Université Paris-Sacaly.
I work at the crossroads between differential geometry and probability theory. I'm interested in the geometry and topology of random hypersurfaces obtained as the vanishing locus of Gaussian processes on an ambient Riemannian manifold. Studying these objects involves techniques coming from various mathematical fields, such as complex geometry, semi-classical analysis, or the theory of random point processes.
I got my Ph.D. from Université Claude Bernard Lyon 1 in 2016, under the supervision of Damien Gayet. Then, I was an "agrégé-préparateur" (postdoctoral position with teaching duty) at ENS de Lyon until 2018. From 2018 to 2020, I was a postdoc at Sorbonne University, where I worked with Henrik Ueberschär within the SpinQS ANR project.
Finally, I was a postdoc at Laboratoire de Mathématiques d'Orsay for a year, before being recruited there as a "maitre de conférences" (assistant professor) in September 2021.
Evgenni Chzhen
I was holding the FMJH postdoc position from October 2019 until September 2021 at the LMO. Despite the covid pandemic, I was able to develop my own research agenda, which was made possible thanks to the support of the FMJH and the amazing scientific environment maintained in the UPSaclay ecosystem. During my PhD studies at l’Université de Marne-la-Vallée, I was mainly dealing with the statistical problem of classification under distribution-dependent constraints, which often arise in modern applications.
Later, mainly during my postdoc at LMO at l'Université Paris-Saclay, I pivoted towards the statistical study of fairness properties of learning algorithms.
Currently, I am holding a CR CNRS position at LMO and continue contributing to the statistical studies of ethical questions arising in machine learning.
I am a statistician. My research concentrates on the theme of multiple testing. I am in particular interested in confidence bounds for the number of false positives in any selection set, with uniform error control. I have also worked on optimal p-value weighting and multiple testing with discrete p-values.
I did my PhD between 2015 and 2018 in the LPSM (Sorbonne University), with co-advisors Etienne Roquain and Pierre Neuvial. Then I worked 2 years and a half for a start-up before coming back to academic research in 2021. As a result, I have been a "maître de conférences" at Université Paris-Saclay since September 2021.
Geometric group theory is my research field. It aims at revealing relations between some algebraic structures and geometry. One specific point of this field, and which is really exciting, in my opinion, is the manipulation of mathematical objects coming from many different areas of mathematics. Functional analysis, probabilities or algebraic geometry appear along proofs.
My Ph.D. thesis was defended in 2011 and written between Geneva and Lyon. Thanks to a grant from the Swiss National Foundation, I spent one year in Jerusalem as a postdoc. Then, I have been assistant professor at Élie Cartan Institute in Nancy. Since 2021, I’m professor in the department of mathematics at Orsay.
Maud Delattre
I am interested in parametric estimation in models with Markovian dynamics and latent variables (mixed-effects models, diffusion models, ...). I study the theoretical behavior of estimators and I develop algorithms (EM, stochastic EM, ...). I am also working on questions of the selection of variables in these models.
Most of my research is motivated by applications in pharmacology, epidemiology, or even plant biology. I developed most of my research within the UMR AgroParisTech / INRAE "Mathematics and Applied Computing" where I was a maître de conférences from 2012 to 2020.
I am now a research fellow in the INRAE lab Mathématiques Informatique Appliquée, du Génome à l'Environnement (MaIAGE) in Jouy-en-Josas.
My research interests lie at the frontier of mathematical statistics and applied probability, with a special focus on nonparametric statistics (both from a frequentist and a Bayesian perspective) for stochastic processes, especially for jump processes. I am also interested in the comparison of statistical models in the Le Cam sense and I love to work on distances between continuous or discrete observations of stochastic processes.
After defending my Ph.D. thesis in Grenoble in 2015 under the supervision of Sana Louhichi and Pierre Étoré on asymptotic equivalences for nonparametric models, I joined Aad van der Vaart's research group in Leiden, where I started working on Bayesian nonparametric statistics. I then moved to Markus Reiß’s research group in Berlin where I focused on (minimax frequentist) statistics for jump processes, a topic I continued to work on during my stay in Magdeburg.
From 2018-to 2019 I was a visiting professor at the University of Potsdam and since 2020 I am a professor in the mathematics laboratory (LMV) of the University of Versailles St-Quentin-en-Yvelines.
Muriel Boulakia
I am working in the field of Partial Differential Equations. My works focus on the mathematical analysis of fluid-structure interaction problems and the analysis and the numerical methods for inverse problems. Part of these works is motivated by the field of biomedical applications, in particular cardiac electrophysiology and hemodynamics.
After a PhD thesis at UVSQ under the supervision of Jean-Pierre Puel and a postdoc at Inria Paris in the REO project team with Jean-Frédéric Gerbeau, I have joined the LJLL at Sorbonne Université as an assistant professor in 2006.
Since 2021, I am a professor in the mathematics laboratory of the University of Versailles St-Quentin.
My main interest is in symplectic topology in a very wide sense, going from fundamental aspects, like Floer cohomology and Fukaya category all the way through applications, ranging from Hamiltonian dynamics and Hamilton-Jacobi equations, real algebraic geometry, functions of several complex variables, or microlocal theory of sheaves. I am always fascinated by the depth and number of these applications.
I started my career as Chargé de Recherches at Ceremade (Paris-Dauphine) from 1985 to 1991, then was a Professor at Orsay (1991-2001), at Ecole Polytechnique (2011-2021), Ecole normale supérieure (2011-2021) and I am finally back at Orsay where I am delighted to reconnect with old acquaintances and also meet many new colleagues.
My research interests are at the frontier of Probability, Discrete Mathematics, and Statistical Physics. I am particularly interested in quasi-reversible interacting particle systems, in probabilistic cellular automata, and iterated Brownian motion ad libitum.
I did my PhD thesis in LaBRI (computer science department of University of Bordeaux, France) from 2012 to 2015 under the supervision of Jean-François Marckert. Then, during one year (from 2015 to 2016), I was a research and teaching assistant in Mines Nancy and in the probability and statistics team of IECL (mathematics department of Nancy, France). After that, for three years (from 2016 to 2019), I was a postdoctoral researcher in the mathematics department of NYU Shanghai (the New York University of Shanghai, the Chinese branch of NYU) in China. Then, I was a CNRS postdoctoral researcher in the probability and statistics team of LMO (mathematics department of University Paris-Saclay) for two years (from 2019 to 2021) financed by the ANR MAlIn (Interacting Random Walks).
Since 2021, I am an assistant professor in the same team and I teach math at the IUT of Sceaux.
Jean-Marie Mirebeau
My research is devoted to the design of numerical schemes for the resolution of partial differential equations, often related to optimal control and optimal transport, and their applications. My specialty is the resolution of strongly anisotropic equations, which locally favor certain directions of space, by addressing the resulting numerical difficulties using computational geometry tools. These works are motivated by applications to mathematical image processing, seismic tomography, and trajectory planning or detection.
I defended a PhD thesis in 2010, under the supervision of Albert Cohen at Pierre and Marie Curie University, on the subject of approximation theory with anisotropic triangulations. In 2011, I joined Paris-Dauphine University as a CNRS researcher and started a collaboration with Laurent Cohen on mathematical methods for medical imaging.
I joined the Orsay mathematics department at University Paris-Saclay in 2015, then the Borelli center at ENS Paris-Saclay in 2020 as research director.
In my research, I work on links between algebraic structures, combinatorics, and geometry. On the algebraic side, my main interest lies in the representation theory of associative algebras and abelian, exact, and triangulated categories. I am interested in applications of these structures to the geometry of polytopes such as the associahedron, to the combinatorics of triangulations and dissections of surfaces, and to the theory of cluster algebras.
After obtaining a degree in mathematics in Sherbrooke (Quebec, Canada), I have defended my thesis at Université Paris-Diderot in 2011, followed by a one-year postdoc in the LMNO at Université de Caen. In 2012, I have joined the LMO at Université Paris-Sud/Université Paris-Saclay as a lecturer.
I am currently a professor in the LMV at Université de Versailles Saint-Quentin, since September of 2020.
Yann Brenier joins LMO in Septembre 2021.
Laure Saint-Raymond joins Laboratoire Alexandre Grothendieck in September 2021.