sentences:  He briefly worked at Milbank, Tweed, Hadley & McCloy, a renowned New York law firm; however, in 1948 he moved into academia and started teaching in the Cornell Law School, where he later became a professor of comparative law.He also wrote important studies of civil procedure and international business transactions and directed a ten-year international research project on contracts.In 1975 he left, as Professor Emeritus, and became a professor in the University of California's Hastings College of the Law, until his retirement in 1995.