Professor Percival joined the Maryland faculty in 1987 after serving as senior attorney for the Environmental Defense Fund. While in law school, he served as managing editor of the Stanford Law Review and was named the Nathan Abbott Scholar for graduating first in his class. Percival served as a law clerk for Judge Shirley M. Hufstedler of the U.S. Court of Appeals for the Ninth Circuit and for U.S. Supreme Court Justice Byron R. White. Percival also served as a special assistant to the first U.S. Secretary of Education.
Percival is internationally recognized as a leading scholar and teacher in environmental law. For more than two decades he has been the principal author of the country's most widely used casebook in environmental law, Environmental Regulation: Law, Science & Policy, now in its seventh edition (http://www.erlsp.com). He is the author of more than 100 publications that focus on environmental law, federalism, presidential powers, regulatory policy and legal history. Percival has taught as a visiting professor of law at Harvard Law School in 2000 and 2009 and at Georgetown University Law Center in 2005 and 2011. He received the University System of Maryland Board of Regents’ ‘Faculty Award for Collaborative Teaching’ in 2005 and in 2007 he was named the University's 'Teacher of the Year.’ In 2014 Percival received the ‘Senior Distinguished Education Award’ from the IUCN Academy of Environmental Law in recognition of his outstanding teaching and contributions to the field of environmental law (http://www.iucnael.org/en/academy-awards/environmental-law-education-awards/218.html?layout=blog). He currently teaches Environmental Law, a Global Environmental Law Seminar, Constitutional Law, and Administrative Law.