Rogers Behavioral Health

Medical Staff Directory


As one of the largest multi-specialty behavioral health practices in the U.S., our patients have a care team committed to their individual road to success.

Our team is backed by strong medical and clinical leadership in a private, non-academic setting. More than 75 board-certified psychiatrists and 40 psychologists, are part of a medical staff of nearly 150 who are specialists in mental health and addiction who work as a team and partner with a premier multidisciplinary group of behavioral specialists, nurses, therapists, and dietitians.

Stephan Siwiec, PhD

Clinical Supervisor, Psychologist

Stephan Siwiec, PhD, is a board-certified psychologist and clinical supervisor at Rogers Behavioral Health in Oconomowoc where he works with adult patients in the OCD and Anxiety Adult Residential Care.

Dr. Siwiec received his Bachelor and Master of Arts in Psychology from Boston University. He then earned his Master of Science in Psychology and PhD from the University of Wisconsin-Milwaukee.

Dr. Siwiec has been with Rogers since 2015 in many different roles, including doctoral level practicum student, research assistant, and clinical supervisor. Recently, Dr. Siwiec served for several years as a clinical services supervisor in adult residential care for both the Depression Recovery and the OCD, Anxiety, and Depression programs in Oconomowoc. Dr. Siwiec also supervised the adult OCD and Anxiety outpatient programs in Oconomowoc.

Dr. Siwiec is a member of the American Psychological Association, the Association for Behavioral and Cognitive Therapies (ABCT), the Anxiety and Depression Association of America (ADAA), and the International OCD Foundation (IOCDF).

Staff Directory

Call 800-767-4411 or go to to request a free screening.