John James Stevenson was born on October 10, 1841, in New York City, New York.

He was an American geologist and author. He studied at New York University (B.D., 1863). In 1863, he went to upper New York State, where he taught mathematics and natural science for a year at the Mexico Academy. He was an editor of the American Educational Monthly. In 1865, New York University granted Stevenson an honorary degree of D.D. He resigned from his post as an editor after completing his further studies at New York University (M.A., 1866; Ph.D., 1867) and undertook a professional career as a geologist in the western mining regions. He became a Professor of Chemistry and Natural History at West Virginia University (1869–1871) and then served as Professor of Geology at New York University until 1909. He was a geologist for the United States Geological Survey (1873-1874, 1878-1880) and a member of the Geological Survey of Pennsylvania (1875-1878, 1881-1882). He served as the first secretary of the Geological Society of America (1888-1890), and, in 1898, he became its president. He was vice-president of the American Association for the Advancement of Science (1891-1892), president of the New York Academy of Science (1896-1898), and a member of the American Philosophical Society. Stevenson held the honorary degree of LL.D. from Princeton, Washington, and Jefferson. He published numerous articles, papers, and books related to his field of study.

In 1865, he married Mary C. Ewing (1841–1926). He died on August 10, 1924, in New Canaan, Connecticut.

Agnes Marshall Logan Stewart was born in 1796 in Montreal, Quebec. She resided in England, where she died in 1882. She was the sister of Sir William Edmond Logan (1798-1875), geologist and first director of the Geological Survey of Canada.

B.A., M.D., F.R.C.P., LL.D.; medical superintendent, Manitoba Sanatorium, 1909-1937.

Elizabeth G. Stewart was the niece of Sir William Edmond Logan (1798-1875), geologist and first director of the Geological Survey of Canada. Her mother, Agnes Marshall Logan Stewart (1796-1882), was his sister.

Dr. R. Cameron Stewart was born in Montreal in 1885. He graduated in medicine at McGill University and gained high honours in his course. He took up pediatrics soon after entering practice and was appointed clinical assistant at the Royal Victoria Hospital under the late Dr. F. M. Fry. He remained a member of this department until his retirement in 1949, reaching the rank of Associate Pediatrician. Dr. Stewart belonged to the small group of physicians practicing internal medicine with a leaning towards pediatrics. His special interest was in infectious diseases, and he was on the staff of the Alexandra Hospital for Infectious Diseases for many years. Dr. Stewart was Assistant Demonstrator in Pediatrics from 1924 to 1927, and Demonstrator in Pediatrics from 1928 to 1936 and 1943 to 1949 at McGill University. He was also Assistant Physician to the Student Health Service from 1946 to 1949.