 From 1975 to 1977, he consulted to the Foreign Lawyer Training Program in Washington, DC.He was a member of the Iowa State Advisory Commission to the United States Civil Rights Commission from 1978 to 1988, and a member of the Iowa Law Enforcement Academy Council from 1979 to 1985.Williams was appointed visiting professor on faculty of law at Durham University, Durham, England, from 1984 to 1986, and visiting scholar at Selwyn College at Cambridge University, Cambridge, England, from 1986 to 1987.