Alwin Max Pappenheimer Jr.

Alwin Max Pappenheimer Jr. (November 25, 1908 – March 21, 1995) was an American biochemist and immunologist.

Pappenheimer was noted for his advances in the field of bacterial toxins and in particular for isolation and analysis of the diphtheria toxin for which he received Eli Lilly Award in 1941.

Pappenheimer was professor of biology at Harvard University, His brother John Pappenheimer later became a professor of physiology at Harvard University, and his sister Anne Pappenheimer Forbes became an endocrinologist and clinical professor at Harvard Medical School.

Pappenheimer Jr. received his Ph.D. in organic chemistry from Harvard University in 1932. He joined Harvard in 1958 as chairman of the Board of Tutors in Biochemical Sciences.