Our Team


David Penner M.D.

David Penner MD is a Harvard trained psychiatrist who is double boarded in both Psychiatry and the Sub-specialty of Child and Adolescent Psychiatry.  His psychiatry residency and fellowship through Harvard Medical School provided extensive training in medical psychiatry with his medical consult liaison training at Brigham and Women’s Hospital in Boston, among the top 20 best hospitals in the nation according to the US News and World Report’s Best Hospitals Honor Roll 2018-2019.  Dr. Penner earned his Medical Doctorate from Vanderbilt University School of Medicine.  He is a native of southwest Washington and earned his undergraduate degree from the University of Washington.  He has served as an expert witness, independent medical examiner, as well as a guest lecturer at Harvard Medical School through Cambridge Health Alliance. His private practice consists of extensive management of patients with difficult to treat depression.


John Holttum M.D.

John Holttum MD is double boarded psychiatrist adding over 30 years of clinical experience to the Olympia TMS team, treating both adults and children and adolescents.  His training at the prestigious Western Psychiatric Institute at the University of Pittsburgh was supplemented by additional training in pediatrics and neurology.   Dr. Holttum earned his Medical Doctorate as well as his two undergraduate degrees from the University of Washington. He has provided services for Catholic Community Services, Community Youth Services, Mary Bridge Hospital and served as a consulting psychiatrist and expert witness for the State of Washington’s Medical Quality Assurance Commission.  He is co-author of two textbooks on medication management in psychiatry, has served as Adjunct Professor at Heritage College, and as a clinical instructor at Providence St. Peter Hospital.  Dr. Holttum’s decades of experience in management of difficult to treat depression provides invaluable advanced expertise to the Olympia TMS team.

Ashley Whitley MBA

Serving as Olympia TMS’s Clinical Director of TMS Operations. Ashley has previous experience in TMS clinic operations. She began as a TMS Technician and has been certified directly by MagVenture to use all of their TMS devices. Over the last couple of years, she has become extremely passionate about TMS Therapy and how many lives it is changing daily. She has earned her Master’s degree majoring in Mental Health and Wellness with an emphasis in Healthcare Administration as well as a Bachelor’s degree  in Professional Dynamics of Healthcare and Advanced Patient Care. She completed her Certified Medical Assistant program at South Seattle College and is also state certified through NHA. Ashley specializes in operations management, policy, risk management, quality control, ethics, HIPAA, and technician excellence. She is a proud member of the Clinical TMS Society and strives to continue education regarding TMS as it evolves.