OUR LICENSED PROFESSIONALS
The talents, experience and expertise of our staff makes a difference in ensuring a smooth continuum of recovery care and support. We also think it makes a difference in helping us increase recovery success rates.

Read on to find out more about our distinguished staff:
William Messinger, BA, JD, LADC
Samuel Dresser, M.B.A., LADC
Joy Bannister, LADC, CADC III
Berkeley Lewis, BCCR, CADC III
Dan Dowdle, LADC
Ginger Washburn, RN
Terry Hunt, BA, EdD
Kate Lehmann, MA, ADC-T
Wes Barnhart
Elizabeth Sommerville

William Messinger, JD, LADC
President
One reason Bill started ARP was to improve recovery rates for functional alcoholics and addicts after seeing friends and treatment peers repeatedly relapse and suffer due to the inability to stop using alcohol/drugs. Using treatment concepts modeled after highly successful programs for physicians and pilots, Bill advises families in adopting similar approaches for their addicted loved ones to prevent relapse and attendant malpractice concerns. Bill received his BA from Yale; his JD from the University of Minnesota; and his chemical dependency training at Hazelden. He has a thorough understanding of the treatment needs of the affluent and prominent, as well as the challenges these individuals face when returning home after treatment.
Email Bill directly: bill@arprecovery.com
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Samuel Dresser, MBA, LADC
Chief Operating Officer
Sam joins ARP as Chief Operating Officer after 13 years with the world-renowned Hazelden Foundation where he gained extensive experience ranging from providing clinical care to patients and their families to providing strategic business planning expertise to senior management in the areas of clinical improvement, program design, and the business systems that support them. He has worked with hundreds of families and addicted people over the years while serving as a counselor, clinical supervisor and clinical director. In addition to being a licensed alcohol and drug counselor, he holds an MBA from the University of St. Thomas in Minneapolis, Minn. Sam brings to ARP a wide array of clinical skills, business acumen and demonstrated leadership that will assure that ARP continues to be the preferred choice by families, businesses and treatment professionals around the world.
Email Sam directly: sam@arprecovery.com
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Joy Bannister, LADC, CADC III
Senior Clinical Associate
Joy has over 20 years experience as an alcohol and drug counselor. Prior to joining ARP, Joy worked as a counselor on the Shoemaker unit at Hazelden. With her ability to work well with family members and their advisors in gathering assessment information, Joy (along with Berk) evaluated hundreds of patients at Hazelden for the assessment program. She is known for her levelheaded demeanor and quiet, yet determined manner in dealing with resistance in the intervention process. Originally trained in England, she received her LADC from Hazelden with expertise including trauma and chemical dependency in women.
E-mail Joy directly: joy@arprecovery.com
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Berkeley Lewis, BCCR, CADC III
Senior Clinical Associate
Having worked in a variety of treatment and recovery settings, including Hazelden Foundation, Berk brings a wide variety of clinical skills to ARP. Berk has engaged a multitude of clients, both individually, and groups in arresting the disease of addiction, and in coping with the many difficulties it brings to families. Through the years, Berk has worked as counselor, clinical supervisor, and relapse prevention specialist. Berk has worked with several agencies in program development, including those addressing the needs of professionals, and adolescents.  Berk specializes in intervention, post treatment recovery, and counseling for families and similar “ systems”.
E-mail Berk directly: berk@arprecovery.com
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Dan Dowdle, LADC
National Director of Services
Dan s many years in the addiction field include working for top tier primary treatment providers as a counselor, crisis manager, licensed interventionist, and program development manager. He received his education and training from the Hazelden Foundation in 1999, and has gone on to work in major treatment centers around the country including Hazelden, Cirque Lodge, and The Life Healing Center of Santa Fe. Recently, Dan brought his experience to the Mayflower Center in San Rafael California to help build and develop its program. Through his background working directly with patients and their families, he has a profound understanding of how to navigate addiction related crises. His extensive network of addiction recovery resources makes Dan one of the most highly sought after resources for interventions and referrals by treatment professionals and families all over the country.
E-mail Dan directly: dan@arprecovery.com
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Ginger Washburn, RN
Senior Clinical Associate
Ginger specializes in family nursing with a focus on mental health and chemical dependency issues. Her expertise includes identifying the benefits, side effects and interactions of drugs commonly used for depression, anxiety and related disorders. She excels at helping clients interact with treatment centers. Other areas of focus include dual diagnoses, interventions, and the impact of addiction and recovery on women's health issues.
Email Ginger directly: ginger@arprecovery.com
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Terry Hunt, BA, EdD
Senior Clinical Associate
Terry is a Harvard-educated therapist specializing in family systems and the emotional trauma resulting from addiction and other destructive behaviors. He is co-author of the books: Emotional Healing and Secrets to Keep, Secrets to Tell. Terry also advises extended families and leads workshops on wealth and addiction. He excels at conflict-resolution and facilitation of family meetings. Terry is also a therapist with Market Street Health in Massachusetts.
Email Terry directly: terry@arprecovery.com
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Kate Lehmann, MA, ADC-T
Kate brings rigorous clinical training and wide ranging experience to her work.  A licensed counselor, Kate is also involved in ARP’s public policy and outreach efforts.  She has experience working with family owned firms and small businesses and a lengthy career in film and television production.  She has a BA from Smith College, an MA in Organizational Leadership from the College of St. Catherine, and received her MA in Addiction Counseling from Hazelden. She has served on several non-profit boards, and is a past president of PFund, a GLBT community foundation serving the upper Midwest. Kate brings a substantial background to ARP and is a valuable addition to our team
E-mail Kate directly: kate@arprecovery.com
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Wes Barnhart
Manager of Professional Services
Wes is an important part of our support structure and actively works to meet the needs of our clients through logistical planning and administration. Wes comes to us with an extensive background in Information Technology. He has been a vital part of building our internal procedures, and helping us prepare for the challenges we will face as the nature of business and business technology changes.
E-mail Wes directly: wes@arprecovery.com
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Elizabeth Sommerville
Manager of Operations
Liz brings over twenty years of executive and managerial experience to ARP. Her extensive background includes work with elite law firms as well as human services organizations. Elizabeth has the necessary understanding of recovery and treatment to manage ARP's operational business. She is an integral part of our office structure, connecting clients with the appropriate level of care and supporting them through the process.
E-mail Liz directly: liz@arprecovery.com
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