Early career Williams worked as a staff psychologist at
Arkansas State Hospital starting in 1955, the first African-American psychologist to be hired at a state mental health facility in Arkansas. The ABP was established as a response to the
American Psychological Association (APA) due to backlash at what was perceived by some psychologists as the APA's conscious and unconscious support for the racist nature of American society. A central ethos of the ABP was that members understood that they were "Black people first and psychologists second". The focus of
Black psychology for Williams was to "be about the business of setting forth new definitions, conceptual models, test theories, normative behavior, all of which must come from the heart of the Black experience". While serving as President of the Association of Black Psychologists (1969-1970), Williams created The 10 Point Plan and mailed it to 300 colleges and universities. This plan was instrumental in recruiting and sustaining Black graduate students in Masters and Ph.D. psychology programs throughout the United States.
Academia From 1970 to 1992, he served as a professor of psychology and African and African-American Studies at Washington University in St. Louis. He founded the department of
Black Studies in
Arts and Sciences at Washington University in St. Louis and served as its first director, ultimately developing a curriculum that would serve as a model throughout the country. After his retirement from Washington University, Williams worked at the
University of Missouri in Columbia as a visiting professor from 2001 to 2004, becoming the interim director of Black studies from the years 2002–2003. Williams wrote over 60 scholarly papers throughout his career on topics across psychology and black studies. In 2014, Washington University honored his legacy with a conference regarding the importance of maintaining diversity within academia. In 2017, he received a Legacy Award at the university's Trailblazers recognition ceremony. ==Black Intelligence Test of Cultural Homogeneity (The Black Test)==