Henry Trendley Dean (August 25, 1893 – May 13, 1962), was the first director of the United States National Institute of Dental Research and a pioneer investigator of water fluoridation in the prevention of tooth decay.
Author: U.S. Federal Government. Photographer is unknown. Source: The photo is a cropped version of the original, which is Order Number B010350 in the National Library of Medicine. The photo was reprinted in page 935 of: Division of Oral Health, National Center for Chronic Disease Prevention and Health Promotion, CDC (1999). "Achievements in public health, 1900–1999: Fluoridation of drinking water to prevent dental caries". MMWR Morb Mortal Wkly Rep48 (41): 933–40. License: PD US HHS CDC