Epstein was called to the Ontario Bar in 1970. He founded Epstein Cole LLP with Kenneth Cole in 1978, and was a senior partner there. Epstein was the Head of the Family Law Section for the Bar Admission Course for the
Law Society of Upper Canada (now the Law Society of Ontario) between 1983 and 1996, and is a former Chair of the Family Law Section of the
Ontario Bar Association. He has been described as “one of Canada’s leading lawyers and lecturers on family law” in Canadian Lawyer magazine and as the “Dean of the family law bar” by the
Toronto Star newspaper. From 1992 to 1997 Epstein was a member of the Child Support Advisory Committee, which advised the
Canadian Department of Justice's child support team on the implementation of child support reforms. From 1997 – 2007 he was a member of the Department of Justice's Advisory Working Group On Family Law and Spousal Support Advisory Committee. These positions were by appointment of the
federal government of Canada. Epstein was a
Bencher and Governing Member of the Law Society of Upper Canada between 1984 and 1999. During this time, he served as the chair for the Law Society's Admissions and Equity Committee, Legal Aid Clinic Funding Committee, and Education Committee. He co-founded the Dispute Resolution Officer Program for the
Ontario Superior Court of Justice, and acted as a Dispute Resolution Officer of the Ontario Superior Court of Justice between 1995 and 2015. Epstein represented clients in appellate matters and acted as a
mediator and
arbitrator. In addition to being a former Dispute Resolution Officer of the Superior Court of Ontario, Epstein was a Certified Mediator/Arbitrator of the ADR Institute of Ontario, and a Certified Mediator with the Ontario Association for Family Mediation. Epstein was appointed
Queen's Counsel in 1981. ==Awards==