Our Team

Our team of professionals is dedicated to our mission of fostering long term, healthy changes in the lives of our clients. We draw on diverse backgrounds and experiences to help our clients achieve recovery. 

Arden O’Connor founded the O’Connor Professional Group to address the needs of families and individuals struggling with an array of behavioral health issues, including addiction, mental health disorders, eating disorders, learning, and other developmental challenges. With several relatives in recovery, Arden is passionate about helping families and individuals navigate the highly fragmented treatment system in a way that creates positive outcomes and allows families to heal.
Arden is a graduate of Harvard College and Harvard Business School. She remains heavily involved in community activities, as a board member of Winsor School Corporation, Collaboration for Family Flourishing, Massachusetts Association of Mental Health, and Justice Resource Institute (former chair). Previously, she served as a board member for the Harvard Club of Boston, Victory Programs, and Harvard Business School Alumni Association of Boston. She maintains professional affiliations with the following organizations: Attorneys for Family Held Enterprises, Boston Estate Planning Council, Worthy Circles and Family Firm Institute.


Diana Clark

Diana Clark is OPG’s Chief of Clinical Operations. She is the author and facilitator of several workshops specifically designed for family members and the recently released book Addiction Recovery: A Family’s Journey’. Diana offers a calm, compassionate and logical voice during a time of family turmoil. She also works in a supervisory role with OPG’s family coaches, and collaborates extensively with case managers on cases where she provides coaching services to families.

Diana holds a Masters Degree in Counseling Psychology from Antioch University and prior to working in the addiction field, Diana was a practicing labor and employment attorney advising employers about the need for clear, compassionate and enforceable policies.


Andy KangAndy Kang, J.D, LICSW is the Director of Clinical Services at OPG.  He is responsible for the supervision, training and management of case managers and sober companions, overseeing the clinical direction of client work.  As a member of the leadership team, Andy participates in strategic planning, as well as the gathering and analysis of outcomes measures relating to OPG clients.

Andy is a licensed independent therapist. He completed his clinical training at the Boston College Graduate School of Social Work. Prior to becoming a therapist, Andy was a counselor of a different kind, practicing law for ten years in the areas of complex commercial litigation and employment law in Boston. Andy now treats professionals, addressing the barriers to wellbeing with an aim of de-stigmatizing mental health care and helping individuals, couples and families in need.

Andy is also an Adjunct Professor at the Boston College Graduate School of Social Work, teaching courses in Substance Abuse and Diversity.


Jeremy Varnum

Jeremy Varnum is the Director of Operations at OPG. In this capacity, he helps coordinate the logistics around engagements with families, and designs appropriate service recommendation packages for clients. Additionally, he supervises case managers who are responsible for delivering these services to our clients. With over 5 years of personal experience in recovery, Jeremy’s approach incorporates motivational interviewing, combined with outdoor education, adventure therapy, and mindfulness based stress reduction. Jeremy has a BS in Kinesiology (Outdoor Education) from the University of New Hampshire and is currently pursuing his Master’s in Social Work. When he has free time, Jeremy can be found outdoors rock climbing, snowboarding, and hiking.



William Messinger, JD, LADC, is a Senior Advisor at OPG. Bill’s mission is to improve recovery rates for functional alcoholics and addicts, with an emphasis on beneficiaries and family business members. Shortly after completing treatment in 1995, he learned that doctors and pilots had very successful outcomes in comparison to other groups due to their unique treatment regimes. Bill then initiated the concept of applying their recovery protocols to other groups. He combines legal and addiction expertise to help families, trustees, and professionals address addiction in family members and beneficiaries.

Bill has written extensively on the topic of applying the pilot/physician model to the affluent, including an article on suggested model language to use in trusts to replicate the pilot/physician model. His articles also address the impact of SUDs on family offices and professionals, recovery management, and the treatment needs of the affluent. He is a graduate of Yale College, University of Minnesota Law School, and the Hazelden School of Addiction Studies. His website is www.BillMessinger.com




Jonathan Paul, OPG’s New York Regional Director, is a licensed social worker in the state of New York. Jonathan graduated Yeshiva University with a Masters in Social Work in 2010. He has since practiced addiction counseling, psychotherapy, and case management in a variety of outpatient chemical dependency programs, mental health centers, and private practice.  Jonathan helps individuals, couples and families afflicted with mental health and addictive disorders find solutions to their problems. As a native New Yorker, born and raised in Manhattan, he enjoys taking walks in the city with his golden retriever, running in Central Park and weekend adventures to the country-especially during fall, his favorite season.






Tanya Beecher, MSW, LICSW is a clinical social worker with over 15 years of experience with adolescents, adults and families. She has worked in multiple settings including therapeutic boarding schools, addiction treatment centers, college counseling offices, and in private practice.  Over the years, she served as the clinical director and senior clinician in adolescent and adult programs.  Tanya brings clarity, compassion, and a belief that people who are suffering emotionally want a way out, they just often do not know how.  She is gifted at reaching through to clients deeply stuck in self-defeating patterns.  Tanya thoughtfully guides families in the process to provide on-going education and support to assist healthy family change.  Tanya studied Exercise Science as an undergraduate, and holds a Masters Degree in Clinical Social Work from Smith College School for Social Work.  She specializes in addictions, dual diagnosis, eating disorders and trauma. Tanya lives in Western Massachusetts where she enjoys many local outdoor pursuits from rock climbing to skiing to road biking.


Justin Cambria

Justin Cambria is currently in the final year of dual Clinical Masters in Social Work and Masters in Business Administration (MSW/MBA) at Boston College. He is completing his advanced social work field placement at OPG, providing case management and coaching services to OPG clients. He also participates in various business projects at the company, spanning marketing, sales, operational, and strategic functions. Justin previously worked as a full time case manager at OPG and held marketing and sales roles at various Boston area consumer tech startups including CoachUp.com. He is a yoga teacher (RYT-200 from HYP Studio in Wellesley, MA), and a self-taught meditation instructor with experience leading Rebel Recovery meditations at South Boston Yoga and grad student group meditations at Boston College. Justin is a father to a young daughter, an avid road cyclist, a squash player, and a yoga and meditation practitioner. He loves to support all paths to recovery in any way possible.




David Carrigan

David Carrigan is OPG’s Director of Digital Marketing and a Case Manager.  He received his Bachelor’s degree in Psychology from the University of New Hampshire in 2012. Since that time, David has worked in a number of capacities within the mental health field. He has spent the last two years as a Senior Recovery Specialist at The Center for Motivation and Change: Berkshires, an inpatient substance abuse rehabilitation facility, and prior to that as a supervisor at a residential program for adolescents with behavioral issues. He specializes in working one on one with individuals to set and achieve their treatment goals and believes in a motivational client centered approach. David is an experienced group facilitator and active in his local community. He is trained in Motivational Interviewing, Cognitive Behavioral Therapy and Dialectical Behavior Therapy. He is a trained SMART Recovery Facilitator and runs a weekly SMART Recovery group in addition to volunteering as a youth mentor. David is currently pursuing his Masters Degree in Social Work at Boston College.


Randi Coleman

Randi Coleman has been a professional interventionist and consultant for over 15 years. She is an expert in addiction counseling and consulting, which provide a diverse foundation for her work. Randi combines traditional techniques with modalities such as mindfulness and motivational coaching. She believes that connecting with her clients in a meaningful way, such as through active listening, is the key to effectively working with families.

Randi’s background includes creating individualized treatment based on multi-dimensional criteria, and she is highly sought after for her successful work in intervening and transitioning clients into treatment. Randi is an expert in all stages of addiction treatment, and specializes in family consulting, and individual continuing care for sustainable and long term recovery.

Randi holds a Masters Degree in Psychology from Antioch as well as certifications in both California and Florida as an Addictions Counselor. Randi has been a preferred provider of Continuing Care for The Betty Ford Clinic, Sierra Tucson, The Meadows and Hazelden; Randi has also received advanced training from Terry Gorski, Pia Mellody and Patrick Carnes, PhD., The Meadows and The Betty Ford Center.


Siobhan Flanagan

Siobhan Flanagan is a Licensed Independent Clinical Social worker who has been providing mental health services to individuals and families in various settings for more than 15 years. Siobhan’s approach is empathic, warm, collaborative, and respectful, and informed by the belief that the individual or family is the true expert on their experience. Siobhan believes strongly in the power of the therapeutic alliance, and believes establishing a trusting relationship is imperative to achieving positive change. Her work is guided by these principles and the belief that there is always a possibility to create meaningful change. She continues to be amazed by the incredible strength of families facing adversity, such as having an addicted loved one, and their resilience and ability to heal continues to inspire her. Siobhan enjoys working with all client populations and has had experience working in various treatment settings including inpatient psychiatric, outpatient mental health, and community based assertive community treatment.


Kaitlin Gatti

Kaitlin Gatti serves as the Marketing Associate at O’Connor Professional Group. She provides administrative support to the team and helps with day-to-day operations in the office. Kaitlin holds a Bachelor’s degree from Plymouth State University in Marketing and Professional Communication. Her personal experience with family and friends makes her dedicated and passionate about working in the behavioral health field. In Kaitlin’s free time, she enjoys snowboarding, hiking and spending time with her family.





“GlenGlen Harnish is a case manager at O’Connor Professional Group. He holds a Bachelor of Arts in sociology from Connecticut College and is pursuing education in both coaching and clinical social work. Glen takes a compassionate, client centered approach in his work. He focuses on clients’ adaptive strengths, and believes that “the best way to get rid of weeds is to have a strong garden.” Glen has worked extensively with dual diagnosis individuals struggling with addictions, problems with time management, motivation, procrastination, anger and avoidance issues. He helps clients develop systems, strategies and tools in order to manage their lives more effectively. Also models positive interactions and behaviors. His interests include rock climbing, Brazilian Jiu Jitsu, hiking in the white mountains, stacking rocks on the beach, and mountain biking in the woods of the greater Boston area. He leads meditation centered recovery groups in Cambridge, MA. Glen also serves as a volunteer member of the Massachusetts Department of Mental Health Internal Research Board  (IRB) which reviews protocols of researchers seeking approval to enroll patients in research projects.


Nancy Kahn

Nancy Kahn has over 18 years of personal knowledge and experience in recovery and the field of addiction. Her dedication and individualized approach stems from both personal experience and professional practices when working with individuals and families struggling with addiction. Nancy’s focus and approach tailors to her patient’s specific needs while integrating various professional methods of recovery. Nancy has a degree in Psychology and Business Administration from North Shore Community College and is currently pursuing an Addiction Counseling Certification at Bunker Hill Community College.


Christopher O’Connor is the Special Projects Coordinator at O’Connor Professional Group. He manages social media, blog posts, the website, the treatment center directory, and other special projects. Chris’ struggles with addiction were the emotional impetus for the founding of the company. He is open about his colorful background, and uses his personal experience to write about public policy and mental health issues. Chris has been published on elephantjournal.comsalon.comgawker.comelitedaily.comthefix.comshatterproof.org, etc.

Chris received his bachelor’s degree from UMASS Amherst. He is currently pursuing a doctorate in clinical psychology at William James College in Newton, MA with a concentration in forensics. He is actively involved in several community recovery groups, and especially enjoys working with the incarcerated population.



Paul Sawyer is a Licensed Certified Social Worker with a broad range of experience in the behavioral health field. He has worked in inpatient, residential, and outpatient settings with individuals who are experiencing substance abuse and mental health challenges. He completed his Masters in Clinical Social Work at the Boston College School of Social Work.

Paul incorporates motivational interviewing and mindfulness with a strength-based, person-centered approach to help his client’s reach their personal goals. Paul has a talent for developing a strong therapeutic relationship with the individuals he works with by providing a genuine, compassionate, and non-judgmental environment. He believes that people can make lasting-changes to their lives given the proper conditions and support. He is open to, and driven by, each client’s stated goals, understanding that every journey to recovery is unique. In his free time, Paul enjoys hiking, playing soccer, racquetball, running, and just about any other sport, in addition to finding time for daily meditation.



Brie Shelly, MS, LMHC, CRC, is OPG’s Director of Client Intake and Outreach. She received her Masters in Clinical Rehabilitation and Mental Health Counseling from the University of North Carolina (UNC), Chapel Hill. While completing her undergraduate studies at UNC-Chapel Hill, Brie interned on a cardiac rehabilitation unit and at an exercise-based breast cancer recovery program (Get Real & Heal) and discovered her passion for understanding how others overcome adversities throughout the lifespan. Brie went on to complete research under Dr. Cindy Bulik at The Center of Excellence for Eating Disorders at UNC (CEED) during her graduate studies Since then, Brie has gained experience working in all levels of care and at other various treatment programs including: at Veritas Collaborative’s adolescent continuum, as an Adjunct Instructor on CEED’s inpatient and partial units, on Monte Nido’s Eating Disorder Center of Boston’s PHP/IOP unit, and on McLean Hospital’s 3East DBT-focused inpatient and transitional units. She has experience in conducting both individual, family, and group therapeutic sessions, with attention to using Motivational Interviewing, CBT, ACT, and DBT modalities. Brie also loves incorporating animal therapy and the outdoors into sessions. Brie is committed to providing her clients with the tools and strategies to achieve healthy physical, emotional, and behavioral change.