Admitted New York bar 1924. Member firm Freshman & Averbach, Syracuse, 1924-1930. Averbach & Goldstein, 1930-1932.
Private practice 1932-1941. Averbach & Bonney, Seneca Falls, 1941-1955. Member firm Gair, Finley, Averbach, Mahley & Hoffmann, Syracuse, Seneca Falls, New York City, 1955-1962, Gair and Averbach, 1962-1975.
Private practice Syracuse, Seneca Falls, New York City, Buffalo, 1955-1975. Vice president, general counsel to Rumsey Manufacturing Corporation, also Rumsey Products, Inc., 1941-1947.
Associate editor personal injury and and tort law National Association Claimants Compensation Attorneys law journal Honorary fellow American College of Legal Medicine. Fellow of International Academy Law and Science. Member American Trial Lawyers Association (past vice president, Board of Governors), International Academy Trial Lawyers (president of the board directors), Legislative Committee New York State Association Plaintiffs Trial Lawyers, Inc.
(board directors), Federal bar associations of New York, New Jersey, Connecticut, American, International, Onondaga County, New York State (trial lawyers section) bar associations, American Judicature Society, Justinian Legal Society, Society Medical Jurisprudence Scribes. Author numerous professional publications, including: Handling Accident Cases, 8 vols. Handling Automobile Cases, 2 vols., Tort and Medical Yearbook (co-editor with M. M. Belli), 2 vols.