Andri Steinþór Björnsson (born 11 January 1973) is a clinical psychologist and an associate professor of psychology at the University of Iceland.

In addition to his work on body dysmorphic syndrome,[1][2][3][4][5][6][7] he has hosted a series of radio programs on science and the scientific method broadcast by RÚV, as well as editing and writing books on science aimed at the general public.

[citation needed] Following his Bachelors and master's degrees[8] in psychology at the University of Iceland in 1998 and 2003, Björnsson attended the University of Colorado Boulder where he wrote a master's thesis on depression amongst college students and received his PhD degree in 2009 based on his doctoral thesis, the topic of which was a randomized clinical trial employing cognitive behavioral group therapy.

[9] He worked as a clinical intern at McLean Hospital/Harvard Medical School where he developed an interest in body dysmorphic disorder, and joined a post-doctoral fellowship at the Warren Alpert Medical School of Brown University where he participated in clinical studies of body dysmorphic disorder.

In addition to his published work on body dysmorphic syndrome and other research in psychology,[10][11][12] Björnsson has written or edited two books aimed at a general audience on the history of science and the scientific method,[13][14] and recently co-edited a book honoring the life and work of Vilhjálmur Rafnsson.