Attorney appellate section, criminal division Department Justice, Washington, 1963-1969, deputy chief legislation and special projects, 1969-1973, chief legislation and special projects, 1973-1975, director Office of Policy and Planning, 1975-1977, director federal criminal code reform project, 1970—1984. Deputy assistant attorney general Office for Improvements in Administration of Justice, 1977-1981, Office of Legal Policy, 1981-1983, deputy associate attorney general, 1984-1985, associate deputy attorney general, 1985-1986, deputy associate attorney general, 1986-1989. Partner Gainer, Rient and Hotis (and successor Gainer and Rient), Washington, 1990—2002.
Consulting attorney on international criminal fraud, since 2003. United States expert member United Nations Committee on Crime Prevention and Control, 1979-1992. Designated member United States Sentencing Commission, 1985-1988, commissioner District of Columbia Sentencing and Criminal Code Revision Commission, since 2008.
Board directors, member advisory committee International Center Criminal Law Reform and Criminal Justice Policy, 1992—2008.