The aptitude scores of 70 physicians in various areas of practice who were tested between 1934 and 1971 were compared with aptitude battery scores obtained by the general population of Johnson O'Connor Research Foundation examinees. For each aptitude test, obtained-score distributions were produced for the time periods of pre-1941, 1941-45, and each year from 1946 through 1972, allowing for better control when comparing physicians' scores with those of the general population of Foundation examinees. The Mann-Whitney U Test was used to evaluate the statistical differences between the physicians' and general population's score distributions. Results showed that physicians scored significantly higher in knowledge of English vocabulary, as well as in many other aptitudes, including structural visualization, clerical speed, finger dexterity, foresight, analytical and inductive reasoning, and several memory and musical abilities. Most of these aptitudes have obvious applications in either medical training or medical practice. Results of the Occupational Follow-up Questionnaire also indicated that 70% of the physicians rated their work very rewarding, while 23% rated it essentially satisfying. (KSA)