Professor Welkowitz joined the Whittier faculty in 1983. Prior to that time, he practiced law as a litigation associate with Stroock & Stroock & Lavan in New York. At Whittier, he has taught numerous courses, to first-years and upper-level students alike. His primary teaching emphases have been Civil Procedure and intellectual property, particularly Trademark law. He has also created more than a dozen lessons for the Center for Automated Legal Instruction (CALI) in Civil Procedure, Trademarks, and Copyright. He was a CALI Fellow in Trademarks in 2003 and a CALI Fellow in Copyright in 2004. From 2006-2009, he served as the Director of the Whittier Law School Center for Intellectual Property Law. His scholarship has ranged from topics in Civil Procedure to various intellectual property issues, both domestic and international. He is the author of a treatise on Trademark Dilution law and a co-author of a casebook on Rights of Publicity. His articles have been cited by courts, treatise writers in both Civil Procedure and Trademarks, and numerous articles.