Evergreen Treatment Services is a private, nonprofit organization which has been delivering evidence-based addiction treatment services to citizens in Western Washington since 1973. 

Led by Ron Jackson, M.S.W., the agency's Executive Director and Sam Cullison, M.D., the clinic's Medical Director, ETS has earned a nationwide reputation for excellence in the treatment of opioid dependence and other addictive disorders.  A staff of over 80 professionals, including clinicians with advanced degrees in medicine, psychiatry, nursing, psychology, social work, and counseling, currently provides opioid treatment services to approximately 900 patients at three clinic locations. Outreach services offer intensive case management assistance to indigent alcohol abusers on the streets of downtown Seattle.

ETS is committed to improving the quality of drug abuse treatment through involvement in research and the application of research findings to clinical practice. The agency is currently participating as a community-based treatment program site in in the Washington Node of NIDA's Clinical Trials Network.  Over the past 10 years, ETS' research department has played a principal role in over 11 major federally-funded research projects on topics ranging from the effectiveness of acupuncture in the treatment of cocaine dependence, to brief interventions for HIV risk reduction among injection drug users, to the impact of contingency management on methadone treatment outcomes. The results of these and other studies have been published in prominent peer-review professional journals.

Helping to train future clinicians in empirically-grounded approaches to addiction treatment is an important goal at ETS.  The agency serves as a clinical training site for social work and physician assistant students at the University of Washington.  It also provides training in the use of acupuncture in addiction treatment to students from Bastyr University and other alternative medicine educational institutions.