In human chemistry, Gustavus John Esselen (1888-1952) was an American chemist noted for being the consulting chemist for the 1948 book We Human Chemicals by Thomas Dreier, wherein he gave suggestions on chemical terms and analogies. [1]

Education
Esselen completed his AB in chemist (1909) and PhD in chemistry (1912), thesis: “Studies on Benzhydrols: I: The resolution of p-Aminobenzhydrol into its optical isomers, II: The splitting of Benzhydrols by the action of bromine”, both at Harvard University.

References
1. Dreier, Thomas. (1948). We Human Chemicals: the Knack of Getting Along with Everybody. (section: Genesis of this Book, pgs. xiii-xv). Updegraff Press.

Further reading
● Esselen, Gustavus J. (1948). “There Are No Atheists in the Laboratory”, in Guideposts: Personal Messages of Inspiration and Faith, by Norman Peale, pgs. 183-87.

External links
● Gustavus John Esselen (biography) – American Chemical Society.