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Alain Bensoussan
Professor-Management
Office MailstopMail Box: SM30, Room No.: SOM3.211 
Email Address  axb046100@utdallas.edu    Primary Phone Number 972-883-6117    URL Bensoussan Alain's Webpage    Media Contact
 Professional Preparation
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 DegreeMajorInstitutionYear
 Ph.D.MathematicsUniversity of Paris, France1969
 M.S.Economics and StatisticsEcole Nationale de la Statistique et de l’Administration Economique1965
 M.S.Mathematics and SciencesEcole Polytechnique1962
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Description of the Research Works

1 INTRODUCTION
Trained in Control Theory, my main field of expertise consists in connecting methods from Analysis and Stochastic Processes in view of solving concrete problems of applied mathematics, not necessarily arising from Control.
In the course of my scientific career I have supervised around 20 PhD students.


2 DESCRIPTION OF RESULTS
2.1 STOCHASTIC PARTIAL DIFFERENTIAL EQUATIONS

I was among the early initiators of the theory of stochastic PDE in the sense of Ito. I worked in particular, alone or in cooperation, on stochastic monotone equations, stochastic Navier-Stokes equations, stochastic variational inequalities, and more recently on stochastic inertial manifolds.
This theory has found some of its most interesting applications in the study of nonlinear filtering theory, where the work of my former student PARDOUX is a reference.
Note that numerical resolution is now within reach, which makes this field of research quite active and quite useful for applications.


2.2 FILTERING AND CONTROL OF STOCHASTIC DISTRIBUTED SYSTEMS
These problems have been at the origin of my research. In particular my thesis (under the supervision of J.L. LIONS) was devoted to Kalman filtering for linear systems with white noise inputs on both time and space. My main contribution was to make use of the theory of cylindrical measures of
Gelfand Vilenkin and L. Schwartz. This permits a rigorous approach to a large variety of problems, provided the model is linear.
I was in particular able to apply these techniques to a bidimensional model playing a role in image processing, or to the problem of optimal location of sensors.
In the problem of control, I contributed strongly to the theory of necessary conditions, and to a rigorous approach of Dynamic Programming via nonlinear semi-groups.
The main field of application concerns the stochastic control of systems with partial information, which naturally has a huge domain of applications.


2.3 OPTIMAL STOPPING, IMPULSE CONTROL, VARIATIONAL AND QUASI VARIATIONAL INEQUALITIES
I discovered, which is now standardly used, that variational inequalities corresponded to the dynamic programming treatment of optimal stopping, and then solved, with J. L. LIONS, the impulse control problem, via a new theory, called the theory of quasi variational inequalities. This has initiated a long and fruitful cooperation on this topic with J.L. LIONS and many colleagues and students. Many applications of this theory concern old and new problems of Operations Research and Management, as well as Physics and Mechanics.

2.4 REGULARITY of NONLINERAR SYSTEMS of ELLIPTIC and PARABOLIC PDE and APPLICATIONS
Stochastic Nash differential games lead to sytems of elliptic and parabolic PDE. The regularity of solutions is extremely important for obtaining a Nash point. This has motivated a longstanding cooperation with J. FREHSE, one of the worldwide specialists of the regularity of elliptic systems. I have also solved with him the ergodic case, which even in the case of one equation was open in its full generality.


2.5 ROBUST CONTROL and RISK-SENSITIVE CONTROL
My interest for this domain stems from its connection with the field of Risk sensitive stochastic control. In fact, I first solved with J. VAN SCHUPPEN the problem of finding a sufficient statistics(of the same size as the the state, which was an open problem) for the LEG (Linear ExponentialGaussian) control. More recently, in cooperation with J. BARAS and R. ELLIOTT, for the partial information case, and H. NAGAI and J. FREHSE for the full information case, I have contributed several results to justify some earlier formal treatment. The connection between robust control and risk sensitive control can be best seen through small noise introduction and singular perturbations. This is a field of very active research worldwide, by the broadness of the applications and the use of many mathematical techniques. It is one of my current research areas.


2.6 EXACT CONTROLLABILITY

After the introduction of the HUM method by J. L. LIONS, and its use by many authors, I got interested in developing a general theory of exact controllability for infinite dimensional systems,where the dynamics is driven by a skew-symmetric operator. In this way, one can unify most of the existing results concerning wave equations, Maxwell equations, ...


2.7 HOMOGENIZATION

Initiated by the probabilistic interpretation of homogenization, my interest in this domain has widened into an important cooperation with J.L. LIONS and G. PAPANICOLAOU, where we have developed many general approaches to this very fruitful theory.
More recently with L. BOCCARDO and F. MURAT I have considered the homogenization of Bellman equations, and with G. BLANKENSHIP the case of random homogenization.


2.8 REGULAR and SINGULAR PERTURBATIONS

Homogenization can be viewed as a particular situation of singular perturbations. But of course many other situations can be considered. It was natural for me to be interested in their application to Control theory, both deterministic and stochastic, and in the latter case with full or partial information. Many particularly useful results can be obtained in the case of partial information, where one can derive approximate but accurate finite dimensional feedback laws, where the optimal one is infinite dimensional.


2.9 SPECIFIC PROBLEMS in OPERATIONS MANAGEMENT and in FINANCE

Since Control Theory has a lot of applications in many areas of Quantitative Management, I have cooperated with several specialists of the field to obtain the solution of concrete problems. My current interest lies in Operations Management and in Finance. I have been working in the design of complex options with M. CROUHY and D. GALAI. More recently, with my student H. Julien, I have investigated models of options for incomplete markets, where the incompleteness arises from ”frictions” in the management of portfolios. Another approach to this problem has been developed with N. TOUZI and J. L. MENALDI, using penalty approximations and Viscosity methods. Since I joined UTD, the University of Texas at Dallas, I have been working on Inventory Control problems, with S. Sethi, M. Cakanyldirim, and PhD students. Our research focuses on stochastic models with partial information ( a field where little is available ), on service constraint models, on s, S policies. I have been also involved , jointly with S. SETHI, in models of Economic Growth developed by K.J. ARROW and al., taking into account population growth aspects.

Collapse Section Expand Section Publications
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  YearPublication  Type
forthcoming
Handbook in Mathematical Finance. With Q. Zhang. Elsevier. Forthcoming.
Category: Handbook in Mathematical Finance
Book
forthcoming
Diagnostic Systems, Optimal Maintenance, Knowledge Based Systems. With R. Mookerjee, V. Mookerjee, and W. Yue. Management Science. Forthcoming.
Category: Management Science
Peer reviewed
2012
Forecasting the energy produced by a windmill on a yearly basis, Stochastic Environmental Research and Risk Assessment (SERRA) (online March 2012) with P.R. BERTRAND AND A. BROUSTE.
Peer reviewed
2012
Existence and Compactness for Weak Solutions to Bellman Systems with Critical Growth, AIMS’ Journals (DCDS-B), vol. 17, no. 6, (September 2012, online May 2012) with M. BULĺČEK and J. FREHSE.
Peer reviewed
2011
Filtering for Discrete-Time Markov Processes and Applications to Inventory Control with Incomplete Information. With M. Cakanyildirim, and S.P. Sethi. Handbook on Nonlinear Filtering. Forthcoming.
Category: Handbook on Nonlinear Filtering
Peer reviewed
Collapse Section Expand Section Appointments
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DurationRankDepartment / SchoolCollege / OfficeUniversity / Company
2004-PresentDistinguished Research ProfessorSchool of Management University of Texas at Dallas
2004-PresentDirectorInternational Center for Decision and Risk Analysis University of Texas at Dallas
2004-PresentEmeritus Professor  University of Paris Dauphine
1999-2002Chairman  ESA Council (European Space Agency)
1996-2003President  CNES (Centre National d'Etudes Spatiales)
1984-1996President of INRIA  Institut National de Recherche en Informatique et Automatique
1980-1985Part time Professor  Ecole Normale Superieure
1975-1977Director  European Institute for advanced Studies in Management, Brussels
1975-1977Chairman  Mathematics Department of the University Paris Dauphine
1971-1973Professor  European Institute for advanced Studies in Management, Brussels
1970-1986Part time Professor  Ecole Polytechnique
1969-2004Associate then Full Professor  University of Paris Dauphine
 News Articles
Group Honors Work by Risk Analysis Center Director
UT Dallas News Center
UT Dallas School of Management Professor Alain Bensoussan has been named one of the charter fellows of the Society for Industrial and Applied Mathematics (SIAM), the world’s leading applied mathematics society.
 
Dr. Bensoussan, distinguished research professor and director of the School of Management’s International Center for Decision and Risk Analysis, is one of 183 members of the inaugural class of the SIAM Fellows Program. The fellowship program recognizes distinguished representatives in academia, government and industry for their contributions to the fields of applied math and computational science.
 
Eight of the honorees are from Texas: four from UT Austin, two from Rice University, one from the University of Houston and one from UT Dallas.

Authority on Risk Analysis Named Fellow of Mathematical Society
UT Dallas News Center
Dr. Alain Bensoussan, professor of risk and decision analysis and an Ashbel Smith Professor in the Naveen Jindal School of Management at UT Dallas, is among 1,119 international mathematicians who have been named Fellows of the American Mathematical Society (AMS) for 2013.
 
This is the inaugural class of honorees. The Fellow designation recognizes outstanding contributions to the advancement and use of mathematics.
 
Bensoussan’s research focuses on decision-making under uncertain circumstances. Some examples of the many areas where this research is applied include financial markets, forecasting wind energy, designing structures that can resist earthquakes and developing strategies for stabilizing an aircraft, Bensoussan said.

Expert on Risk Analysis Unveils New Journal
UT Dallas News Center
Risk and decision analysis—a timely topic in the unfolding meltdown of world financial markets—is the focus of a new quarterly journal co-edited by a UT Dallas School of Management professor and published for the first time this month.
 
Co-editor Alain Bensoussan says Risk and Decision Analysis looks at risk in various venues, including industrial operations and services management, finance, insurance, energy, safety and security, health care and the environment.
 
Bensoussan is Distinguished Research Professor in the School of Management and director of the school’s International Center for Decision and Risk Analysis. He shares editing duties with Charles Tapiero, the Topfer Distinguished Professor and chair of the Department of Finance and Risk Engineering at New York University-Polytechnic Institute.

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 Additional Information
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DISTINCTIONS
  • Member of the French Academy of Sciences - 2003, Correspondent Member 1986
  • Member of the French Academy of Technology, 2000
  • Member of the International Academy of Astronautics -1999
  • Member of Academia Europae 1985
  • Fellow IEEE - 1985
  • Von Humboldt Prize - 1984
  • Legion d’Honneur (Officier) - 2003
  • Ordre National du Merite (Commandeur) - 2000
  • BundesVerdienst Kreuz (Officier) - 2003

SCIENTIFIC RESPONSIBILITIES
  • Vice Chairman of the IFAC ”Mathematics of control” Committee from 1978 to 1981.
  • Member of the organizing Committee of the IFAC World Congress (1981).
  • Member of the selection Committee for the session Control Theory and Optimization, International Congress of Mathematics, Helsinki 1978 and Chairman for the same session, Warsaw 1982.
  • Chairman of AFIRST, Franco-Israeli Association for Science and Technology from 1992 to March 1999.
  • Member of the Advisory Council of the Institute for Systems Research, University of Maryland.
  • Member of the Board of the Pitman Advanced Publishing Program in Mathematics.
  • Member of the Advisory Board of Mathematical Finance.
  • Editor in Chief of Asymptotic Analysis Journal (IOS Press).
  • Member of the Editorial Board of the following journals
    • Journal of Applied Mathematics and Optimization
    • Journal of Nonlinear Analysis
    • Numerical Functional Analysis and Applications
    • Policy Analysis and Information Systems
    • Sciences de Gestion
    • Systems and Control Letters
    • Acta Applicandae Mathematicae
    • Stochastic Analysis and Applications
    • Control Theory and Advanced Technology (C-TAT)
    • International Journal on Stochastic Hydrology and Hydraulics
    • Kybernetes
    • Optimal Control - Applications and Methods
    • Applied Mathematics Letters
    • Progress in Systems and Control Theory
    • Mathematical Models and Methods in Applied Sciences (M3AS)
    • Nonlinear Functional Analysis and Control Theory
    • Applied Mathematical Finance

Awards and Recognition
  • Charter Fellow, Society for Industrial and Applied Mathematics (SIAM), 2009.
  • Member of the French Academy of Sciences, 2003 Correspondent Member, 1986
  • Legion d’Honneur (Officier), 2003
  • BundesVerdienst Kreuz (Officier), 2003
  • NASA, Distinguished Public Service Medal, 2001
  • Ordre National du Merite (Commandeur), 2000
  • Member of the French Academy of Technology, 2000
  • Member of the International Academy of Astronautics, 1999
  • Member of Academia Europae, 1985
  • Fellow IEEE, 1985
  • Von Humboldt Prize, 1984

Professional Organizations
  • Institute of Electrical and Electronics Engineers
  • Society for Industrial and Applied Mathematics
  • The Institute For Operations Research and The Management Sciences (INFORMS)

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