Dr. Scott Losk and our team of our doctors and clinicians provide diagnostic assessments, clinical trials and supportive counseling for you and your loved one. Neurobehavioral and medical evaluations are available. Each patient is assessed and recommendations are made. With your permission, we also communicate regularly with primary care physicians to maintain continuity of care.


Dr. Losk is a clinical psychologist and neuropsychologist who has maintained a clinical and research practice with Summit Research Network in Portland, OR since 1990.
He has conducted over 50 clinical trials in Alzheimer’s disease since 1990 and has done research on all of the current FDA-approved drugs for Alzheimer’s disease. He was involved in the very earliest research that led to the first ever treatment for Alzheimer’s disease (Tacrine) in 1992. Dr. Losk has extensive clinical and research experience in all
aspects of cognitive disorders. Because of his background, experience and contacts in the pharmaceutical industry, he has access to all of the latest research studies in Alzheimer’s disease.

Click here for Dr. Losk’s interview for the Lund Report

James Bergthold, MD, Principal Investigator

James Bergthold, MD is board certified in Internal Medicine. He received a bachelor’s degree in biology in 1986 from Biola University and a medical degree from the Medical College of Wisconsin in 1992. Following his residency in internal medicine from Oregon Health Sciences University in 1995, he was a partner at HealthFirst Medical Group and the Providence Medical Group. Dr. Bergthold’s special interests include geriatric medicine, cardiology and diabetes. He has been with Summit Research since 2001, and has been an investigator in over 100 clinical trials. He has been a Principal Investigator in studies involving hypertension, diabetes, multiple sclerosis, chronic pain, obesity, Alzheimer’s dementia, insomnia, and migraine headaches.

Karen Wilson, RN, MA

Karen Wilson, RN, MA received her Bachelor of Science in Nursing from OHSU (formerly University of Oregon School of Nursing). She had 12 years of chronic pain rehabilitation experience prior to joining Summit Research Network in 1989. As a research clinician she has experience in clinical trials for such conditions as dementia, depression and anxiety. She received her Masters of Arts in Counseling from Western Seminary in 1997. As a member of the Memory Health Center team at Summit Research Network she has participated in the National Memory Screening event sponsored by the Alzheimer’s Foundation of America for many years. She is the facilitator for our Caregiver Support Group, which is affiliated with the Alzheimer’s Association. She received training as a Certified Geriatric Wellness Instructor and is actively involved in community outreach and education.


Carrie Crider, BS, received her bachelors in Psychology at Portland State University. She has been a Research Clinician at Summit for over ten years. Carrie has clinical trial experience in studies focusing on depression, anxiety, bipolar disorder and Alzheimer’s disease. At Summit, Carrie has been a sub-investigator on over 60 studies. Prior to working at Summit, Carrie attended school at Queens College in New York and worked in a research and publishing capacity studying the effects of dementia on emotion under Dr. Joan Borod. Before this, Carrie worked at OHSU on a cognitive remediation program for children who were cancer survivors.