Clarence O. Simpson
Simpson graduated from the Chicago College of Dental Surgery and from Barnes Medical College (St. Louis). He was in the general practice of dentistry from 1902 to 1918, at which time he limited his practice to radiodontics and oral diagnosis. At Barnes Dental College he was professor of dental anatomy, histology and operative dentistry from 1903 to 1910. From 1926 to 1936 and from 1945 to 1951 Simpson was professor and chairman of Radiodontics at the Washington University School of Dentistry. He served as professor emeritus from 1951 until his death in 1962.
Simpson served as president of the St. Louis Society of Dental Science in 1910, the St. Louis Dental Society in 1918, and the Missouri State Dental Association in 1923. He authored several dental texts, including Advanced Radiodontic Interpretation (1923), The Technic of Oral Radiography (1926), and Principles and Practice of Radiodontics (1936).