Partner Sachs Rosenberg & Kosin, 1954—1961, Rosenberg & Kosin, 1961—1978, Rosenberg & Lake, 1978—1979. Judge Cook County Circuit Court, 1979—1980. Senior partner Lake Rosenberg & Associates, Ltd., Chicago, since 1981.
Lector, chairman seminars. Member citizens board Illinois Masonic Medical Center and Hospital, 1980. Life member Edward T. Lee Foundation of John Marshall Law School, 1980.
With United States Army, World World War II.
Fellow: American Academy Forensic Sciences, American Academy Matrimonial Lawyers (national vice president 1968-1973, permanent board governors). Member: Phi Alpha Delta (Man of Year 1957), Mensa, American Bar Association, Decalogue Society Lawyers, Illinois Bar Association, Chicago Bar Association, Illinois Judges Association, Shriners (Chicago), Covenant (past pres).