William George Iacono is an American psychologist known for his research using behavior genetic methodologies, such as

twin Twins are two offspring produced by the same pregnancy.MedicineNet > Definition of TwinLast Editorial Review: 19 June 2000 Twins can be either ''monozygotic'' ('identical'), meaning that they develop from one zygote, which splits and forms two em ...

and adoption studies, to study the development of common

mental disorder A mental disorder, also referred to as a mental illness or psychiatric disorder, is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. Such features may be persistent, relapsing and remitt ...

s and substance abuse. He has also researched the relationship between substance use and

cognitive impairment Cognitive deficit is an inclusive term to describe any characteristic that acts as a barrier to the cognition process. The term may describe * deficits in overall intelligence (as with intellectual disabilities), * specific and restricted defici ...

among adolescents. He is a Distinguished McKnight University Professor in the Department of Psychology at the

University of Minnesota The University of Minnesota, formally the University of Minnesota, Twin Cities, (UMN Twin Cities, the U of M, or Minnesota) is a public land-grant research university in the Twin Cities of Minneapolis and Saint Paul, Minnesota, United States. ...

, where he is also the co-director, with

Matt McGue Matt McGue is an American behavior geneticist and Regents Professor of psychology at the University of Minnesota, where he co-directs the Minnesota Center for Twin and Family Research. Career McGue received his B.A. in psychology (minor: mathe ...

, of the Minnesota Center for Twin and Family Research. Before joining the faculty of the University of Minnesota in 1985, he was an associate professor at the

University of British Columbia The University of British Columbia (UBC) is a public research university with campuses near Vancouver and in Kelowna, British Columbia. Established in 1908, it is British Columbia's oldest university. The university ranks among the top thre ...

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* Living people University of Minnesota faculty Behavior geneticists 21st-century American psychologists Academic staff of the University of British Columbia Carnegie Mellon University alumni University of Minnesota alumni Year of birth missing (living people) {{US-psychologist-stub