Fagen was formerly a senior partner in the Litigation Department of Paul, Weiss, Rifkind, Wharton & Garrison LLP. As a trial lawyer, he had litigated on behalf of both plaintiffs and defendants for more than 42 years.
His work was profiled in an American Lawyer cover story, “The Lifesavers,” in which Paul Weiss was selected as the best litigation firm in the United States.[3] He has served as chair of the firm's Litigation Department.
He is an adjunct lecturer in law at Columbia Law School[4] and an adjunct professor of law at Brooklyn Law School.[5]
Fagen is a trustee of the Kohlberg Foundation,[6] a member of the Board of The Brennan Center or Justice[7] and a member of the Columbia Law School Board of Visitors.[8] Fagen is a Fellow of the American College of Trial Lawyers.
He is the author of numerous publications on intellectual property, product liability and arbitration. Fagen is also the author of a monograph on the life of Paul, Weiss's late patriarch Judge Simon H. Rifkind, published in The Yale Biographical Dictionary of American Law[9] and the editor of At 90. On the 90's[10].[9]