Nicholas Christenfeld is a former professor of Psychology at the University of California, San Diego until his dismissal in 2019. He first joined the department in 1991 and was a full professor from 2003 to 2019. Among other research, he has promulgated the Theory of Deadly Initials and the theory that infants resemble their fathers more closely than they do their mothers.[1] More recently, he studied the tendency of people to choose purebred dogs which resembled them.[2]