Rainier Clinical Research Center, Inc.

Center Information

Leslie J. Klaff, MD, Ph.D
Rainier Clinical Research Center, Inc.
723 SW 10th Street, Suite 100
Renton, WA 98057

Currently Enrolling Trials

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Therapeutic Areas

Cardiology/Vascular Diseases
Healthy Volunteers
Internal Medicine
Nutrition and Weight Loss


Rainier Clinical Research Center is a privately-owned, independent research clinic for Phase I through IV clinical trials of both drugs and devices. We are located in the greater Seattle area. Since our establishment in 1991, RCRC has successfully conducted several hundred research studies with a primary focus on metabolic disorders such as diabetes, diabetes complications, obesity and lipids. We also partner with other successful Principal Investigators in the areas of Cardiology and Neurology. The addition of our Phase I, 10-bed clinic gives us the capability to conduct early development/Phase I studies requiring extended clinic stays and inpatient visits, pharmacokinetic and pharmacodynamic studies and insulin-glucose clamp studies.Our medical directors are board-certified in endocrinology and metabolism and internal medicine. Our directors have over 25 years of clinical trial experience and hold clinical faculty positions at the University of Washington Medical School.

Our mission is to provide an efficient, safe and professional environment for our study participants and accurate, uncompromised quality of data for our study sponsors.

We pride ourselves on our ability to provide quick study start-up and approval and rapid patient enrollment. Over 25 years of conducting clinical trials, we have built up a database of over 10,000 individuals who have either participated in studies or have interest in participating in studies. We continually add new subjects to the database over a wide variety of therapeutic areas.


We have experience conducting Phase I, II, III and IV trials. Over the past 25 years we have conducted close to four hundred studies of pharmaceutical compounds and medical devices.

Our areas of specialty include: Diabetes, Endocrinology, Lipids, Obesity, Neurology and Cardiology.

Our Phase I, 10-bed in-patient clinic allows us to conduct early development studies that require extended clinic stays and inpatient visits.


Rainier Clinical Research Center is located in Renton, Washington, approximately 10 minutes from the airport and 15 minutes from downtown Seattle. Our site has convenient freeway access and plenty of free parking available for our study participants. Our clinic is fully equipped with an inpatient unit for Phase I studies and outpatient clinic for Phase II-IV studies.


Leslie J. Klaff, M.D., Ph.D.
Medical Director
Board Certified in Endocrinology and Internal Medicine
30 years of clinical research experience

Ronald L. Brazg, M.D.
Medical Director
Board Certified in Endocrinology and Internal Medicine
25 years of clinical research experience


Full time staff members:

  • 2 Physicians
  • 1 Executive Director
  • 9 Clinical Research Coordinators (includes 2 Registered Dietitians and 2 Registered Nurses)
  • 2 Research Assistants
  • 3 Patient Recruiters
  • 2 Lab Technicians
  • 1 Receptionist
  • 2 Regulatory and Administrative Staff
  • 1 Clinic Operations Manager


Patients who participate in clinical trials at our site come from a variety of sources. We have a research database of over 10,000 thousand individuals and we are continually building our database through advertising and patient recruitment activities.

We are located about fifteen minutes south of downtown Seattle serving the greater Seattle area with a population of over a million people. We are able to quickly and efficiently enroll eligible patients for studies.


Our directors serve as Principal Investigators for clinical trials in the areas of diabetes, diabetic complications, lipids, and obesity. We work with Principal Investigators in other therapeutic areas such as Cardiology and Neurology.

Contact Center

If you are interested in contacting this center to discuss clinical trials, please complete and send the email form below. A representative from the research center will then follow up with you.