Memorializes David S. Festinger (1962-2021). He was best known for the impacts of his research contributions in the area of substance abuse treatment-particularly around issues of law and ethics. His interest in researching and promoting ethical principles for research participants was strongly influenced by the experiences of his parents, who were both Holocaust survivors. He served as principal or co-investigator on over 20 National Institutes of Health-funded grants and numerous contracts and grants from other funding agencies. Most of Dr. Festinger's career was spent with the Treatment Research Institute in Philadelphia. His final affiliation was with the Philadelphia College of Osteopathic Medicine, where he conducted research, taught students, and provided clinical supervision to trainees and early career practitioners. (PsycInfo Database Record (c) 2022 APA, all rights reserved).