Came to the United States, 1936, naturalized, 1941. Law clerk, Berlin, Germany, 1931-1933. With Victoria Insurance Company, Paris, France, 1934-1935.
Research assistant New York State Law Revision Commission, 1938-1941, consultant, 1949, 52, 55. Attorney Treasury Department, 1942, OPA, 1942-1946. From assistant to professor of law Rutgers University, Newark, 1946-1954.
Professor of law Ohio State University, Columbus, 1954-1964. Professor of law University Texas, Austin, 1964-1975, Hugh Lamar Stone professor of law, 1965-1975. Visiting professor Columbia Law School, 1952, Louisiana State University Law School, 1962, U. Frankfurt (Germany), 1962, U. ubingen (Germany), 1964, 70, orientation program American law Princeton, 1965, Salzburg Seminar American Law, 1960, Osgoode Hall Law School, York University, Toronto, Ontario, Canada, 1970, Hastings College Law University of California San Francisco, 1972, Institute on Comparative and International Law, Paris, France, 1973.
Visiting lecturer U. Trieste (Italy), 1964,65. Member White House Task Force on Antitrust Policy, 1968. Public member governor New Jersey Committee Public Utilities Labor Disputes Legislation, 1954.
Consultant Agency for International Development, India, 1967.
Author: Competition in Regulated Industries, Transportation, 1961. (with Warren F. Schwartz) Cases and Materials on the Regulation of International Trade and Investment, 1970. Introduction to American Law (in German), 1966.
Also numerous articles. Board editors American Journal Comparative Law. Editorial advisory board Journal Air Law and Commerce, Transportation Law Journal.
Reporter International Encyclopedia Comparative Law.