David Schwartz, MD, Family Practice and Geriatric Medicine
Dr. Schwartz has been the Principal Investigator and Medical Director of Viking Clinical Research Center since 2002. Dr. Schwartz has been something of a “fixture” here in the Temecula Valley for more than 20 years. With experience in Emergency Medicine, and board certification in Family Practice and Geriatric Medicine, Dr. Schwartz has been both principal and sub-investigator in cardiology, urology, and affective-disorder protocols. He has an extremely diverse and large patient population base. Because of this patient population, Dr. Schwartz has been instrumental in ensuring that enrollment is quick and accurate. As the Medical Director or Viking Clinical Research Center, Dr. Schwartz is available for consultation at any time.
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Sana Johnson-Quijada, MD, Psychiatry

Jay Collins Rendahl CCRC, BA, Director of Research Operations, CEO
Mr. Rendahl, one of the founders of Viking Clinical Research, Ltd., has been active in the medical and research communities for more than 25 years. He served honorably in the US Navy, both active and reserve, for 14 years in various medical and psychological capacities. He is a member of the Association of Clinical Research Professionals and received his Bachelor of Arts degree in Psychology from San Diego State University.

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Pamela Alvarez, MD, Neurology

Dr. Alvarez has joined the physicians of Viking Clinical Research Center and specialize in neurology for key studies. Dr. Alvarez is extremely involved with her patient's, and because of this, she is often able to create lists of potential subjects prior to the investigator meeting of a particular study. We feel extremely gracious for the enthusiasm, time and effort Dr. Alvarez has placed in Viking since she has come aboard.
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Edward Cherlin, MD, Psychiatry


Edward Cherlin, MD, Psychiatry

Our Team


Shannon Matteson, MA, Study Coordinator 

Shannon has been a study coordinator since 2016. She has a Bachelors of Arts in Psychology, Bachelors of Science in Education and a Masters of Science in Mental Health Counseling.  We are grateful to have her on our team. 


• San Diego County Medical Association
• San Diego Society of Psychiatric Physicians
• Strattera National Advisory Board
• SHIRE Advisory Board

Maria C. Rodriquez, CRC, BA, Director of Clinical Operations
Carmen has been with Viking Clinical Research since 2012. She is the lead study coordinator. She holds a Bachelors Degree in Social Science with a concentration in medical anthropology. She has over 14 years of experience coordinating clinical research trials in the area of CNS; Urology, Cardiology, Gastroenterology, Alzheimer's and MDD.   

Ryan Woodaman, COO, Bachelors in Business, Regulatory
Ryan Woodaman is our Regulatory Affairs Officer. He has been with Viking Clinical Research since 2011. With a Bachelors in Business; Ryan also assists with study-feasibility and contracting decisions. He also ensures constant and consistent communication between the coordinator, sponsor, and investigator with regards to study amendments, changes and updates.

Jay Rendahl , CCRC

Brittany Sam, BA, Study Coordinator
Brittany Sam has been with Viking clinical Research since 2012 and has over 8 years of medical and clinical research experience. She is lead study coordinator and facilitates each patient visit. Brittany is also a point person for any technical necessities with regards to EDC, patient diaries, or electronic assessment devices. Brittany is IATA certified. Brittany has completed her BA at Arizona State University in Psychology.

Pamela Alvarez, MD, Neurology

• Diplomat American Board of Psychiatry
and Neurology
• Past Chief of Staff, Mesa Vista Hospital,
San Diego, California
• Past Chief of Staff, Harborview Hospital,
San Diego, California
• American Medical Association
• California Medical Association

David Schwartz, MD


Contact our clinical research center in Temecula, California, for compassionate care from skilled medical professionals.


​​​Alvin Garlejo, MPH, Study Coordinator

Alvin Garlejo has been a study coordinator since 2015. He has a Bachelors Degree in Psychology and a Master's Degree in Public Health. Alvin has been a lead and a back-up coordinator on many studies and is also a go-to person for issues regarding technical know-how.

Deanna Medina

Receptionist/Coordinator Assistant
Deanna Medina has been in the medical profession for over 20 years. She is a study coordinator responsible for lab sample preparation; patient scheduling, obtaining vital signs, and EDC entry. Deanna is IATA Certified

Sana Johnson-Quijada, MD, Psychiatry
Dr. Johnson-Quijada has been our Principal Investigator on a number of CNS protocols since 2003. Dr. Johnson-Quijada (Dr. “Q”) has received accolades from sponsor companies for expedited enrollment, and more importantly, for having a high completion rate in studies that she has overseen at Viking Clinical Research Center. She recently completed studies in the area of generalized anxiety disorder, major depressive disorder, schizophrenia, schizoaaffective disorder, and social phobia.
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Sharon Eaton, Director of Finance
Sharon has been with Viking Clinical Research since 2009. With a background in human-resources and accounting; Sharon is our Financial Director who is responsible for contracts, advertising, and study budgeting. She is also our point-person for creating and maintaining contracts with as-needed ancillary diagnostic sites.