Chapter Officers
Chapter President - Robert Sise, MD, FASAM, MBA, MPH
Dr. Sise is the co-founder of 406 Recovery where he provides addiction psychiatry services across the state of Montana. He and his team of addiction providers have increased access to those suffering from addiction via tele-health practice. Prior to 406 Recovery, he co-founded and served as chief medical officer of the greater-Montana region’s largest psychiatric practice to increase access for Montanans' to quality psychiatric treatment services and crisis care. He served as CEO of a joint venture with the Montana Hospital Association to providing emergency psychiatry consultation to hospitals across the state. Dr. Sise also provided care to Montanans when he joined Billings Clinic and founded the organization’s first addiction treatment clinic. Before leaving Billings Clinic in 2021, he served as Medical Director of Montana’s first EmPATH Unit, led the consult-liaison psychiatry service and created a virtual urgent care service. He has lectured on substance use disorder screening, diagnosis and treatment at both state and regional conferences. Dr. Sise is board certified in general and addiction psychiatry.
Chapter Treasurer - Tammera Nauts, LCSW, LAC
Tammera Nauts, LCSW, LAC is the co-owner of Nauts IBH where she contracts to provide therapy, consultation, and training services. Tammera has broad experience in the substance use disorder and mental health fields, ranging from direct service to the administration of programs and services for all levels of care. She has served diverse populations that include youth and their families, probationers, parolees, women with special needs, employee groups, and clients with co-occurring disorders. She received a B.A. in Education from Western Washington University and her master’s degree in Social Work from the University of Washington. She holds a license in Clinical Social Work and Addiction Counseling.
Chapter Secretary - Dan Nauts, MD, FASAM
Dr. Nauts completed his undergraduate and medical education at the University of Michigan and joined an internal medicine group practice in Bellingham, Washington. He left general internal medicine to develop his Addiction Medicine practice; since that time, he has been instrumental in the creation of inpatient programs for those suffering with substance use and co-occurring disorders, outpatient SUD programs, and medication assisted treatment services. Dr. Nauts is an independent contractor for the Montana Primary Care Association. He is a member of the Drug Utilization Board of Mountain Pacific Quality Health providing oversight to the Medicaid formulary, is recognized as a Fellow of the
American Society of Addiction Medicine (FASAM) and is certified in the subspecialty of Addiction Medicine by the American Board of Preventive Medicine. He is a faculty member of ASAM providing Data 2000 MAT waiver trainings and The Fundamentals of Addiction Medicine courses.
Immediate Past President - Sharon Mulvehill, MD
Dr. Mulvehill was born in Houston, Texas and attended medical school at UT Southwestern in Dallas. She was initially drawn to general surgery, then emergency medicine, before settling into a career in academic family medicine. As the opioid crisis emerged she developed an interest in addiction medicine, eventually pursuing additional training and becoming board certified in addiction medicine. She has practiced at RiverStone Health in Billings, MT since 2005 and now shares her time with Rimrock Foundation as their Medical Director. Dr. Mulvehill has four grown sons, her best friends, and enjoys playing guitar in the soul/funk band Free Spirit SOUL.