William Jefferson Darby (November 6, 1913 – June 6, 2001) was an American nutrition scientist who spent the majority of his career at Vanderbilt University.
Darby had graduated in 1930 and was then working as a salesman at the Fuller Brush Company to earn income in the face of the Great Depression.
[1] He accepted Day's offer so that he could pursue his goal at the time of attending university and studying chemical engineering.
[2] Following his PhD, Darby moved to Nashville, Tennessee to work at the Vanderbilt University School of Medicine as a Special Fellow in Nutrition in the International Health Division.
[2] He then had a one-year appointment as an assistant research professor of nutrition at the University of North Carolina in its school of public health.