Contributions in Mathematical Physics: A Tribute to Gerard G. Emch

This volume is a tribute to Gerard G. Emch, on the occasion of his seventieth birthday. To all of us who have put down their appreciation in writing here, Gerard Emch has been a teacher, mentor and friend. This collection of articles, some inspired by Gerard's own work, is a sequel to the special session, dedicated to him, at the XXVth Workshop on Geometrical Methods in Physics, held in Bialowieza, Poland, from July 2 - 8, 2006.
A large number of Gerard's students, friends and collaborators were invited to that meeting, but of course, not everyone was able to attend. We did however, receive expressions of good wishes from them all. The call for papers also went out to a longer list of names than just the ones represented here. In presenting this volume to Gerard, we offer him our collective good wishes and our thankfulness for having shared with us all that he has - scientifically, professionally and in friendship.