Daniel Gregory Amen (born July 1954)[1] is an American celebrity doctor[1] who practices as a psychiatrist[2] and brain disorder specialist[3] as director of the Amen Clinics.[4] He is a five-times New York Times best-selling author as of 2012.[5]

Amen has built a profitable business around the use of SPECT (single-photon emission computed tomography) imaging for purported diagnostic purposes.[6] His marketing of SPECT scans and much of what he says about the brain and health in his books, media appearances, and marketing of his clinics has been condemned by scientists and doctors as lacking scientific validity and as being unethical, especially since the way SPECT is used in his clinics exposes people to harmful radiation with no clear benefit.[7][8][9][10]

Amen has studied brain injuries affecting professional athletes,[3] and has consulted on post-concussion issues for the National Football League.[11]