Fellow in GI 1959-61 Massachusetts General Hospital (Kurt Isselbacher)
Chief of GI St. Luke's Roosevelt Hospital, Prof. Medicine Columbia University 1961-2000
American Health Foundation and Strang Cancer Center 2000-2007
The Rockefeller University, Laboratory of Biochemical Genetics and Metabolism (Jan Breslow) 2007-present
Present interests translational studies related to nutritional CRC prevention and mechanisms and effects of obesity on CRC and breast cancer.