This workshop will take place at University College Dublin, Ireland, from July 5 to 8, 2004. (The week following ECM 2004 in Stockholm.) The morning sessions will consist of three short courses as follows: "Algebras with Involution" by J.-P. Tignol (Université catholique de Louvain, Belgium) "K-Theory and Arithmetic" by M. Kolster (McMaster University, Canada) "Linear Algebraic Groups" by U. Rehmann (Universität Bielefeld, Germany) Invited and contributed talks will take place in the afternoon sessions. We hope that the workshop will be of particular interest to young researchers in areas related to those mentioned above. The workshop website is located at http://maths.ucd.ie/~workshop2004 and will be updated regularly. Preliminary email inquiries may be sent to: workshop2004@maths.ucd.ie The local organising committee consists of Kevin Hutchinson, David Lewis, Rachel Quinlan, Thomas Unger. Department of Mathematics, University College Dublin, Belfield, Dublin 4, Ireland.