Dr. John (Jack) Mosby Grant (1927-1997) graduated from Princeton University with a degree in physics before receiving his M.D. from Washington University in 1954. During his career, he was on the staff of Barnes Hospital, St. Luke’s Hospital, and St. Louis Regional Medical Center. He also was an Associate Professor of Clinical Internal Medicine at Washington University. From 1959 until his death, he worked for the Grant Medical Clinic along with his brother Neville Grant. The clinic had been organized by their father Samuel B. Grant in 1938.
In addition to his work in medicine, Dr. Grant spent a number of years studying mathematics. His fascination with the possibility of using math in the study of biology led to what he called “hierarchy algebra”. Following his death, a group of friends and colleagues compiled and edited his work on this subject into a paper titled, A Hierarchical Model of Living Systems: A Unifying Concept in Biopsychosocial Medicine. A copy of this paper is available below.