He also co-produced Faces of the Enemy, an award-winning PBS documentary; was the subject of a Bill Moyers' television special in the early 1990s; and for 20 years served as a contributing editor at Psychology Today magazine.
He is also featured in the 2003 documentary Flight from Death.
Keen completed his undergraduate studies at Ursinus College in Collegeville, Pennsylvania, and later completed graduate degrees at Harvard University and Princeton University.
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