21.   After switching from political science, his undergraduate major, Thompson earned a doctorate in film and television studies from Northwestern University.

22.   After earning his doctorate, Alexander became a high official of the Cincinnati public school system.

23.   After earning his doctorate in electrical engineering from Stanford University, Chang joined Texas Instruments and ended up running its semiconductor division.

24.   After he earned his doctorate at the University of Chicago, he joined the American civil rights and peace movements.

25.   After his release, he earned his doctorate and became an expert on the psychological effects of being a prisoner of war.

26.   After the war, Harsanyi remained in Hungary, earning a doctorate in philosophy from the University of Budapest.

27.   After the war, he returned to Harvard, where he earned his doctorate in East Asia studies.

28.   After earning a doctorate at Yale Law School, he taught at Chicago for two years before returning to Yale as an associate professor.

29.   After serving as a Navy communications officer during World War II, he resumed his studies at the University of Wisconsin, where he earned a doctorate in speech.

30.   After graduating from Harvard, Dr. Cohen came to Washington for medical training at Georgetown and then earned a doctorate in gerontology from Union Institute.