Patrick practiced environmental litigation for 17 years, most recently with the U.S. Department of Justice in the Environmental Defense Section of the Environment and Natural Resources Division and, prior to that, with Beveridge & Diamond, P.C. He earned a J.D. from Vermont Law School and externed for the Honorable Paul L. Friedman of the U.S. District Court for the District of Columbia. He teaches Environmental Law at the University of Denver Sturm College of Law.