Oregon Center for Clinical Investigations, Inc. (OCCI) is a dedicated pharmaceutical clinical research company with independent research sites in Portland and Salem staffed by experienced clinical investigators, and highly trained and experienced site directors and research coordinators. With locations in Oregon’s two largest cities, and well-connected investigators with deep roots in their communities, OCCI, Inc. is able to consistently meet recruitment goals for a wide variety of complex phase I-IV research protocols.

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Two locations with diverse patient demographics:

Portland  905 SE 14th Ave, Portland, OR 97214 MAP

Salem  702 Church Street NE, Salem, Oregon 97301 MAP


Beal G. Essink, MD, D-ABPN, Double Board Certified in Psychiatry and Sleep Medicine. PI in Portland on phase II-IV outpatient psychiatry, pain and sleep trials. 200+ trials conducted since 2000.

Drissana T Tran, M.D., Board Eligible in Internal Medicine. 100+ studies.