Robert A. Levy (born 1941 in Washington, DC) is chairman of the libertarian Cato Institute's board of directors. He joined Cato as senior fellow in constitutional studies in 1997 after 25 years in business. He also sits on boards of the Institute for Justice, the Federalist Society, and the George Mason University School of Law. He founded CDA Investment Technologies, a major provider of financial information and software, and was its CEO until 1991. Levy clerked for Judge Royce C. Lamberth on the U.S. District Court in Washington, D.C., and for Judge Douglas H. Ginsburg on the U.S. Court of Appeals for the D.C. Circuit. From 1997 until 2004, Levy was an adjunct professor of law at Georgetown University. He has written numerous articles on investments, law, and public policy. His writing has appeared in the New York Times, Wall Street Journal, USA Today, Washington Post, National Review, and many other publications. Levy has also discussed public policy on national radio and TV programs, including ABC ½s Nightline, CNN's Crossfire, Fox's The O'Reilly Factor, MSNBC's Hardball, and NBC's Today Show. His latest book, co-authored with William Mellor, is The Dirty Dozen: How Twelve Supreme Court Cases Radically Expanded Government and Eroded Freedom. Levy received his Ph.D. in business from the American University and his J.D. degree from the George Mason University School of Law.