Geoffrey C. Hazard Jr., emeritus professor of law at the University of Pennsylvania Law School and longtime teacher of legal subjects at other prominent law schools, died Wednesday at the age of 88, the university announced.

Hazard served as the trustee professor of law at Penn for 15 years, from 1994 to 2009, according to a university statement issued Thursday, and was a leading figure in the fields of civil procedure, judicial administration, and legal ethics.

Before joining the faculty at the University of Pennsylvania, he taught law at Yale, the University of Chicago and the University of California, Berkeley, according to Penn. In 2009, he joined the faculty of the UC Hastings College of the Law, while also continuing to teach courses on advanced federal procedure at Penn Law.