Hall of Visitors : 1997

Joachim H. Rieger Afiliation : Universidade de São Paulo, Instituto de Ciências Matemáticas de São Carlos Address: SMA - ICMSC - USP, Caixa Postal 668, São Carlos - SP 13560-970, Brazil Phone: +55-16-274 3444 Ext. 3775 Fax: +55-16-271 2238 E-mail: rieger@icmsc.sc.usp.br Research area : Computer Vision Period of visit : August 1997

Joachim Rieger is a visiting professor at the Instituto de Ciências Matemáticas de São Carlos. He received a M.S. in Computer and Information Science from the University of Massachusetts, USA, and a Ph.D. in Computer Science from the University of London, England.

Professor Rieger research interests are in Generic Geometry, Computational and Combinatorial Geometry, Symbolic algorithms for stratifying semi-algebraic sets, Classification of singularities of maps and real deformations of singularities and Computer Vision and segmentation of signals.

Leonidas J. Guibas Afiliation : Stanford University, Computer Science Department Address: Gates Building 374, Stanford University, CA 94305, EUA Phone: +415 723-0304 Fax: +415 723-0033 E-mail: guibas@cs.stanford.edu Research area : geometric modeling, vision, robotics, discrete algorithms Period of visit : July 1997

Leonidas J. Guibas is Professor at the Computer Science Department of Stanford University.

His research interests are in algorithms for sensing, modeling, reasoning, rendering, and acting on the physical world. His interests span computational geometry, geometric modeling, computer graphics, computer vision, robotics, and discrete algorithms.

Ken Perlin Afiliation : New York University, Department of Computer Science, Courant Institute of Mathematical Sciences Address: 719 Broadway, Rm 1224, New York, NY 10003, EUA Phone: +212 998-3386 Fax: + 212 995-4122 E-mail: perlin@nyu.edu Research area : Period of visit : July 1997

Ken Perlin is an Associate Professor of Computer Science and the Director of the Media Research Laboratory at the Courant Institute of Mathematical Sciences of New York University. He is also the director of the Center for Digital Multimedia.

His research interests include graphics, animation, and multimedia.

Davi Geiger Afiliation : New York University, Department of Computer Science , Courant Institute of Mathematical Sciences Address: Warren Weaver Hall, 251 Mercer Street, New York, EUA Phone: +212 998-3235 Fax: +212 995-4124 E-mail: geiger@cs.nyu.edu Research area : Computer Vision Period of visit : January 1997

Professor Davi Geiger is a visiting assistant professor at the Courant Institute, New York University. He received the Ph.D. from MIT in Physics working also at the Artificial Intelligence Laboratory. Dr. Geiger has held a visiting position at the Isaac Newton Institute for Mathematics and Applications, in Cambridge, England. Dr. Geiger has also worked in Medical Imaging at Siemens Corporate Research, NJ.

Dr. Geiger's research interest are in computer vision as a visual information science and its applications. In particular, he has been interested on using statistical and robust techniques to detect reliable features for recognition schemes. He has been interested on techniques, methods, and models capable of efficiently combining local features with global ones from a Bayesian framework, e.g. dynamic programming for hidden Markov models and generalizations for Markov random fields. He has succesfully applied these methods on medical and biochemistry imaging, for the detection and analysis (i) of the evolution of the heart, from MRI images (now a product of the Siemens MRI machines) and (ii) of the DNA molecules from miscroscopic imaging (now being used for the GENOME project at the W. M. Keck Laboratory for Biomolecular Imaging, Dept. of Chemistry, NYU.)

Dr. Geiger was the keynote speaker of the 1993, 10th Israeli Symposium on Aritificial Intelligence, Computer Vision and Neural Neworks, and invited speaker on the 1992 SIAM Conference on Linear Algebra and its Applications.

Richard Pollack Afiliation : New York University, Department of Mathematics , Courant Institute of Mathematical Sciences Address: 251 Mercer Street, New York, NY 10012, EUA Phone: +212 998-3167 Fax: +212 995-4121 E-mail: pollack@cims.nyu.edu Research area : Period of visit : January 1997

Richard Pollack is Professor of Mathematics and Computer Science at the Courant Institute of Mathematics of New York University. He is co-editor-in-chief of the journal Discrete & Computational Geometry.

His research interests are in Discrete Geometry, Computational Geometry and Algorithmic Real Algebraic Geometry.