Professor Johnson joined the Mercer faculty in 1993 and served as the Associate Dean for Academic Affairs from 2002-2012. While teaching at Mercer, he has also had the opportunity to teach or visit at Notre Dame Law School, the University of London and Strathclyde University. In 2004, he taught at the University of Tokyo and at Waseda University (Tokyo) on a Fulbright grant.
Professor Johnson received his J.D. from Villanova Law School and an LL.M. in Environmental Law from George Washington University Law School. Prior to teaching, he served as an attorney for the Bureau of Regulatory Counsel in the Pennsylvania Department of Environmental Resources (now DEP) and as a trial attorney for the U.S. Department of Justice, Environment and Natural Resources Division, Environmental Defense Section.
He specializes in Environmental Law, but has also taught Torts, Statutory Law, Administrative Law, and Dispute Resolution. His scholarship focuses on wetlands, environmental justice, economics and the environment, technology and the law, and a variety of administrative law topics. He has also authored several CALI exercises on environmental law and has served on the Board of Directors of CALI for more than a decade.