Bachelor of Science, University of Pennsylvania, 1920; Master of Science, University of Pennsylvania, 1925; Doctor of Philosophy, Fordham University, 1927.
Assistant physiological chemistry, Jefferson Medical College, 1920-1921;
biochemist, Philadelphia General Hospital, 1922-1926;
from assistant director to director, vice president, Food Research laboratories Inc. (predecessor FDRL), 1926-1957;
from director to president, Chairman of the Board, Food Research laboratories Inc. (predecessor FDRL), 1957-1974;
consultant, Bernard L. Oser Associations, Bayside, New York, 1974-1995.
Adjunct Professor Columbia University Institute Nutrition Sciences, 1959-1971.
Trustee Gordon Research Conferences, 1954-1957. Chairman food section International Union Pure and Applied Chemistry, 1961-1968. Member food science mission Department Agriculture, 1963, food protection committee NAS-National Research Council, 1964-1971, joint expert committee on food additives Food and Agriculture Organization (of the United Nations)-World Health Organization.
Fellow American Association for the Advancement of Science, American Institute Chemists, Institute Food Technologists (president 1968-1969, Babcock Hart award 1958), New York Academy of Sciences, Toxicology Forum, American Institute Nutrition. Member American Chemical Society (chairman division agricultural and food chemistry 1946-1947), American College of Toxicology, American Council on Science and Health, American Industrial Hygiene Association, American Institute of Chemists, American Institute of Nutrition, American Society of Pharmacology and Experimental Therapeutics, Association of Vitamin Chemists, National Research Council (food and nutrition board), New York Academy Medicine (associate), New York Institute Food Technologists (president 1968-1969), Academy Toxicological Sciences, Society of Technology, Teratology Society, International Society Regulatory Toxicology and Pharmacology, Flavor and Extract Manufacturers Association (honorary), The Chemists Club ( New York ), Alpha Epsilon Pi, Sigma Xi (honorary), Phi Tau Sigma (honorary).
Married Clara de Hirsch Kotkin, May 27, 1923. Children: Zelda Oser Zelinsky, Alan Stuart.