Thorson, Mark R. MD Back Name: Thorson, Mark R. MD Mark Thorson is a Washington State Cougar who earned his medical degree from the University of Washington. He completed his Internal Medicine Internship, Residency, and General Internal Medicine Fellowship at the University of Iowa where he met his wife Karen. Dr. Thorson is Board Certified in Internal Medicine and practiced general Internal Medicine in Longview for 20 years before joining PeaceHealth in 1999. He has served as President of the St. John Medical Staff and past Medical Director of the Echocardiography for 19 years. He enjoys gardening, Astronomy Club, church activities, and his 3 children. PeaceHealth Internal Medicine B  Address: Internal Medicine B 748 14th Avenue Longview WA 98632-2315 Driving Directions (MapQuest - opens new window) Phone Number: (360) 501-3601 FAX: (360) 501-3648 Specialty Type Internal Medicine Primary Board Certified Year Expires American Board of Internal Medicine 1977 Education Type Specialty Washington State University Undergraduate Education University of Washington School of Medicine Medical Education University of Iowa Hospitals & Clinics Internship Family Practice University of Iowa Hospitals & Clinics Residency Internal Medicine University of Iowa Hospitals & Clinics Fellowship Internal Medicine