American Board of Trial Advocates, Riverside/San Bernardino Chapter: Marlatt, Pres. 2011, Wiesmann 2025.
Assn. of So. Calif. Defense Counsel, Wiesmann, Pres. 2012, Bd. of Dir. 2001-2008; Marlatt, Bd. of Dir. 1991-97; Montgomery, Bd. of Dir. 2009-Present. Members: Marlatt, Wiesmann, Montgomery, Grant, Faustino, DeBus.
Defense Research Institute: Wiesmann, Member 2007-Present.