School of Medicine

Our Clinical Team

Headshot of Marie Soller

Marie Soller, M.D. (she/her), director
Dr. Soller is an assistant professor of psychiatry in the OHSU School of Medicine. She completed her undergraduate and medical education at Stanford University and her psychiatric residency at San Mateo County Behavioral Health and Recovery Services. Dr. Soller has a strong interest in resilience, life work balance and the role of self-care and social support. She is pleased to be a part the Resident and Faculty Wellness Program, working with physicians who might be having personal or professional difficulties. Dr. Soller uses medication evaluation and management, and psychotherapy (cognitive behavioral, psychodynamic, and supportive therapies) to address these issues.

Email: Pager: 10767

Dr. Gillian Lashen

Gillian Lashen, Psy.D. (she/her), associate director
Dr. Lashen is an assistant professor of psychiatry and a licensed psychologist in the Resident and Faculty Wellness Program (RFWP). She earned her doctorate in clinical psychology at the University of Denver and completed her internship at Denver Health Medical Center. Prior to joining RFWP she served as behavioral medicine faculty in an internal medicine residency program, with an emphasis on wellness and resilience.

Dr. Lashen previously conducted research with family medicine residents and worked on an inpatient medical unit providing treatment to adults with severe eating and feeding disorders. Her interests include cultivating wellbeing at work, relationship issues, weight bias and body image, and antiracism. She utilizes an integrative approach with a focus on Acceptance & Commitment Therapy, Relational-Cultural theory and cognitive behavioral intervention.

Email: Pager: 10147

Timothy Beecher

Timothy Beecher, Ph.D. (he/him/his)
Dr. Beecher is an assistant professor of psychiatry and licensed psychologist in the OHSU Resident Faculty Wellness Program. He completed his B.S. at Loyola University Chicago, earned his M.Ed. at Washington State University and received a Ph.D. at the University of North Dakota. He has extensive experience working in higher education and is excited to join the OHSU Resident Faculty Wellness team. 

Dr. Beecher's areas of expertise include working with men in therapy, crisis work, and addressing substance abuse from a harm reduction and motivational interviewing perspective. He incorporates a variety of treatment approaches in his work, including interpersonal process therapy, feminist therapy and psychodynamic principles. He is committed to social justice and works diligently to provide culturally responsive treatment. 

Email: Pager: 13028

Joanne Chan

Joanne Chan, Psy.D. (she/her)
Dr. Chan
is an assistant professor of psychiatry and licensed psychologist in the Resident and Faculty Wellness Program. Prior to joining OHSU, Dr. Chan was a staff psychologist at Portland Psychotherapy, specializing in ACT-informed exposure therapy for anxiety, obsessive-compulsive (OC) and related disorders. She also provided training in evidence-based approaches for anxiety and OC related disorders (including perfectionism) to postdoctoral fellows and practicum students.

Dr. Chan earned her B.A. from the University of California, San Diego, and her Psy.D. from the PGSP-Stanford Psy.D. Consortium. After becoming licensed in 2009, she ran a private practice in the San Francisco Bay Area for several years, conducted clinical research on the effectiveness of various evidence-based approaches for hoarding disorder and provided instruction to masters’ level counseling students as an adjunct professor at the University of San Francisco. In addition to her work with anxiety related issues, Dr. Chan enjoys working with clients who are experiencing issues related to culture, including cultural identity development or anxiety related to discrimination and marginalization. She supports all clients in developing skills to live a life based on values in a high-pressure, fast-paced culture. 

Email: Pager: 13291

Mike Duncan

Mike Duncan, Psy.D. (he/him)
Dr. Duncan
is an assistant professor of psychiatry and a licensed psychologist in the OHSU Resident and Faculty Wellness Program. He earned his B.A. in psychology at the University of Colorado at Boulder and his M.S. and Psy.D. in clinical psychology at Pacific University. He has conducted research on risk and protective factors in LGB youth and on the relationship between internalized sexual prejudice and sense of belonging in LGB graduate students.

Dr. Duncan's clinical interests include mitigating stress and burnout, work-life balance, identity development and authenticity, navigating major life transitions, and improving intimate relationships. He also has a special interest in issues related to sexual orientation, gender identity, and ethical non-monogamy, including experience providing letters of support for gender-affirming surgeries. His therapeutic approach is primarily existential, which means exploring questions of existence, identity and meaning to help his patients move toward more fulfilling and authentic lives lived with vulnerability, responsibility and inner consent. He also integrates cognitive-behavioral interventions and has an interest in mindfulness practices.

Email: Pager: 21117

Dr. Christie Kesserwani

Christie Kesserwani, D.O. (she/her)
Dr. Kesserwani is an assistant professor of psychiatry and board-certified psychiatrist at the OHSU Resident and Faculty Wellness Program. She completed her B.A. at the University of Southern California and obtained her medical degree at Midwestern University prior to completing her psychiatric residency at the Valleywise Behavioral Health Center in Mesa, AZ. Dr. Kesserwani has a special interest in resident physician mental health and founded an inter-departmental therapy group at her training hospital during her final year of residency. She understands the unique challenges faced by physicians in health care today, and utilizes an integrative approach which incorporates therapy, coaching, and/or medication management to help address these challenges.

Email:  Pager: 12289

Sara Walker

Sara Walker, Ph.D. (she/her)
Dr. Walker
is an associate professor of psychiatry, core faculty member in the Clinical Psychology Ph.D. Program at OHSU, and a licensed psychologist in the Resident and Faculty Wellness Program. She grew up in Portland, earned a bachelor's degree from the University of Oregon, a Master's in Counseling Psychology, a Ph.D. in Clinical Psychology from the University of California at Santa Barbara, and completed a postdoctoral fellowship in Clinical Neuropsychology at the University of Michigan School of Medicine.

Dr. Walker returned to Portland to join the OHSU faculty in 2011 and joined the RFWP team in 2021. She has also been active in disaster mental health preparedness and response, as well as sustainability efforts at OHSU, regionally and nationally. She values acknowledging and addressing normal, healthy stress responses, as well as using a multicultural, existential lens to identify, navigate and potentially grow from other challenges or experiences.