A native of Montréal, Thomas Simpson received his M.D.,C.M. from McGill in 1854. After a period of travel and study in Europe, he opened a medical practice in Montréal. He became a coroner in Sault Ste. Marie in 1861, and in 1867 was appointed Indian Commissioner for the Algoma Region of Ontario. In 1872 he returned to Montréal to resume his medical practice. Simpson was in charge of the smallpox ward of the Montreal General Hospital from 1873 to 1875, and in 1880 he became Professor of hygiene in the Faculty of Medicine of Bishop's College, then located in Montréal. In 1884 he was appointed assistant surgeon at the Montreal General Hospital, and joined the consulting staff in 1885. Completely deaf by his mid-fifties, Simpson undertook a second career as a medical officer for a number of insurance companies.

Dr. J.C. Simpson, a native of Brockville, Ontario, received his university training at McGill. He served on the staff of the Faculty of Medicine of McGill University for more than three decades as a teacher, administrator, and as dean. His teaching career at McGill began in 1903 when he was appointed a demonstrator in zoology, while he was still a student. He obtained his B.Sc. degree in 1907 and won a special Sir William Macdonald scholarship, which took him for further studies to the marine biological station at Plymouth, England. He traveled widely after winning several more prestigious scholarships and returned to McGill in 1909, where he was soon placed in charge of the newly created department of biology and embryology as associate professor Dr. Simpson was promoted to a full professorship in 1928 and remained with the department until 1936, when he was made associate dean of medicine. He served as Dean of the Faculty from 1940-1941. After his retirement, Dr. Simpson served as captain in the Royal Canadian Army Medical Corps. (Canadian Medical Association Journal v. 50, pg. 591, 1944)

Edmund E. Simpson was born in San Francisco, California on February 2, 1912. He graduated from McGill Medical school in 1939 after an A.B. at the University of California at Berkeley. He moved to Sacramento and then Davis, California to practice. Founded Blackwood Press in 1956, located in Placerville, California, after buying a 6 x 10 hand press.