Peter M. Callahan, Partner, 1993 Call to the Bar Peter Callahan practices primarily in the areas of Civil Litigation and Family Law. Peter received his B.A. (Hons.) from Queen’s University and continued his education at the University of Windsor where he received his LL.B. in 1991. Peter’s practice has caused him to appear in all levels of courts in the Province of Ontario, including the Ontario Court of Appeal.