Oregon Center for Clinical Investigations, Inc.

Portland 905 SE 14th Ave, Portland, OR 97214 MAP
Salem 702 Church Street NE, Salem, Oregon 97301 MAP

Oregon Center for Clinical Investigations, Inc (OCCI) is a dedicated pharmaceutical clinical research company with independent research sites in Portland and Salem, Oregon. Specializing in trials of investigational medications being developed for treatment in the areas of central nervous system (CNS) and internal medicine, OCCI has successfully conducted hundreds of quality clinical trials, including trials in pediatric, adolescent, adult, and geriatric populations.

With regional access to a potential patient base of over 3,000,000 people, OCCI, Inc. is able to consistently meet recruitment goals for a wide variety of complex phase II-IV research protocols.

OCCI’s Salem facility includes a dedicated sleep research lab with 4 private, fully-PSG-equipped sleeping rooms for evaluation of CPAP titrations, Split-night titrations, MSLTs and MWTs.

Download the OCCI fact sheet.


Beal G. Essink, M.D., 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.