ANNOUNCEMENT OF A COLLOQUIUM TITLE : Category Theory Yesterday,Today (and Tomorrow?) A Colloquium in Honour of Jean Benabou DATE : Friday June 3rd and Saturday June 4th 2011 VENUE : Department of Mathematics, EcoleNormaleSuperieure, 45 Rue D'Ulm, 75005 Paris Confirmed Speakers (in alphabetical order) Jean Benabou Pierre Cartier Francois Chargois Andree Ehresmann Rene Guitart Christian Houzel Andre Joyal Jacques Roubaud Thomas Streicher Titles of Talks with Abstracts and a Full Program of the Meeting will be circulated with the Second Announcement around May 1st 2011 This Two Day Colloquium is the culmination of a week of activities at ENS intended to honour Professor Jean Benabou's contributions to Mathematics over the last half century. Born in Rabat in Morocco in 1932, Jean Benabou entered the EcoleNormale Superieure in 1952, graduating in 1956. He was a CNRS Researcher from 1956 to 1962, then, after a spell at the University of Chicago from 1966-67 at the invitation of Saunders Mac Lane, on his return to France he directed the research seminar in Category Theory at The Institut Henri Poincare (and latterly at the Institut Mathematique de Jussieu) from 1969 to 2001. This Seminar was one of the most influential and fertile centres in the development of Category Theory for much of that period, attracting contributions for over 30 years from some of the leading researchers in the field. Professor Benabou's own contributions to Category Theory have been rich, various and profound, and are ongoing. They will be described in more detail in the Second Announcement. The Contributions to this Colloquium will review aspects of his work and touch on a selection of his interests. The Colloquium Talks will take place on the afternoon of Friday June 3rd and throughout the day on Saturday June 4th. They will be preceded on the morning of Friday June 3rd by the final and open session of a series of Rencontres - Discussions between Professor Benabou and an invited panel of several of his mathematical colleagues, which will take the form of a Round Table. Further details of the subjects for these discussions will also be circulated with the Second Announcement [For admin and other information see: http://www.mta.ca/~cat-dist/ ]