Fig. 1: Education and occupations of best-selling authors.

The highest levels of educational attainment (a) and the occupations (b) of the 83 best-selling authors based on available information. The most common highest degree was a medical degree and the most common occupation was physician. M.D. Doctor of Medicine, N.M.D./N.D. Doctor of Naturopathic Medicine, Ph.D Doctor of Philosophy.