International Board for Certification of Group Psychotherapists
2014-2022 Tony L. Sheppard, PsyD, CGP, AGPA-F
2006-2014 Sherrie L. Smith, LCSW-R, CGP, AGPA-F
2000-2006 Jeanne Pasternak, LCSW, CGP, AGPA-F
1996-2000 Barry Helfmann, Psy.D., CGP, AGPA-DF
1993-1996 Sharon Cheeseman, LICSW, CGP, AGPA-LF