The 1990 Seminar on Stochastic Processes was held at the University of
British Columbia from May 10 through May 12, 1990. This was the tenth in
a series of annual meetings which provide researchers with the
opportunity to discuss current work on stochastic processes in an
informal and enjoyable atmosphere. Previous seminars were held at
Northwestern University, Princeton University, the Univer- sity of
Florida, the University of Virginia and the University of California,
San Diego. Following the successful format of previous years, there were
five invited lectures, delivered by M. Marcus, M. Vor, D. Nualart, M.
Freidlin and L. C. G. Rogers, with the remainder of the time being
devoted to informal communications and workshops on current work and
problems. The enthusiasm and interest of the participants created a
lively and stimulating atmosphere for the seminar. A sample of the
research discussed there is contained in this volume. The 1990 Seminar
was made possible by the support of the Natural Sciences and Engin ring
Research Council of Canada, the Southwest University Mathematics Society
of British Columbia, and the University of British Columbia. To these
entities and the organizers of this year's conference, Ed Perkins and
John Walsh, we extend oul' thanks. Finally, we acknowledge the support
and assistance of the staff at Birkhauser Boston.