Our Team

Shawn M. Hamm, MD

Dr. Shawn Hamm is the first fellowship-trained, addiction medicine boarded physician in the State of Tennessee.  His residency training was in family medicine (he also holds boards in family medicine), providing him with a strong background in physical health problems for patients of all ages.  He became dedicated to addiction medicine through seeing the impact of Substance/alcohol use disorder (SUD/AUD) on close friends, and from experiencing the positive impact that a skilled physician could have on patients with addiction. He has seen that the trajectory of a human life can be turned around as the person regains control of her/his life to become a positively contributing member of society.  Dr. Hamm is a skilled clinician and is dedicated to developing the most effective system of care for patients with SUD/AUD.   Dr. Hamm is Program Director of the Addiction Medicine Fellowship, the only ACGME-accredited fellowship in addiction in the state, and co-Director of IAC’s collaborative Center-of-Excellence with Baptist Memorial Healthcare.  He is a cofounder of IAC.

Drew Blackstock, MD

Dr. Drew Blackstock is also a graduate of the fellowship at the Center for Addiction Science at the University of Tennessee (the Center was founded by Dr. Stern, CEO of IAC) and is boarded in addiction medicine.  He is also boarded in family medicine and has extensive clinical experience in community practice, emergency rooms, urgent care centers and inpatient settings (as a hospitalist).  Dr. Blackstock has seen the negative impact of SUD/AUD both in personal experiences with his extended family and in the many clinical sites in which he has worked. He is extremely effective in reaching out to patients with addictive disorders and drawing them into treatment, and working to develop systems of holistic care that can move patients to plan for a durable recovery.  Dr. Blackstock is a certified SAP (substance abuse provider).  He is passionate about helping those with use disorders and removing the stigma associated with this chronic disease.  He is co-founder of IAC and co-director of IAC’s collaborative Center-of-Excellence with Baptist Memorial Healthcare.  

Dr. Jamie Pettit, EdD, MS, BS, LPC/MHSP

Jamie Pettit, EdD, MS, BS, LPC/MHSP, is the behavioral health specialist/therapist at IAC.  He has over 20 years of experience in counseling, and providing expert behavioral health care in a range of settings and developing services (IOP, MAT, PHP, detox, etc) in treatment centers for SUD/AUD.   He has been clinical director at Foundations Associates/LaPaloma Treatment Center, Connell Behavioral Health/Turning Point Counseling, Dozier House, and other facilities. Mr. Pettit is a lecturer and contributor to the literature in the field of addiction medicine, as well as an author of workbooks for families and patients with SUD/AUD.  He is currently working with the IAC staff to document and standardize the approach to wraparound care.

Ross Nagler, MSW

Ross Nagler, MSW, is a social worker and case manager at IAC Associates PLLC. He has over a decade of experience working with clients dealing with SUD/AUD, and functions as our case manager. Ross regards his role as an active part of integrating the specific social needs of each of IAC’s patients (social determinants of health) and then helping them to meet their treatment goals. Mr. Nagler uses his own personal recovery experiences to guide each patient in her/his day-to-day progression towards a sustainable and effective recovery. He understands that each person’s recovery will be shaped in a different way, and supports the customization process from the vantage point of addressing social issues.  By creating a strong foundation of social support, that is continuous and thoroughly developed, he will help clients pave the way towards substantial years in recovery. His goal at IAC is to encourage our clients to become responsible and productive members of society in order to realize their potential and personal goals.

jayne gipson - IAC Memphis - alcohol and rehab

Jayne Gipson, RN

Jayne Gipson, RN, is chief of clinical operations at IAC Associates PLLC.  She has years of experience working with patients with SUD/AUD, and functions as our care coordinator and intake manager.  Jayne views her role as gaining an understanding of patient issues and being the patient’s advocate to arrange prompt and effective treatment.  Ms. Gipson is sensitively attuned to the needs of our patients, and will efficiently guide each individual through the intake process into treatment.  She understands that in certain situations timely access to a physician is critical, and she will make that happen.  IAC is committed to same or next-day appointments for our patients.

Administrative Team

David Stern, MD

David Stern, MD,CEO of IAC, is the senior member of the group; his passion to change care for patients with addiction stems from the loss of his son Alan in 2008, from a combination of mental health and SUD.  At the time, Dr. Stern was Vice-President for Health Affairs & Dean of the College of Medicine at the University of Cincinnati, and leader of University of Cincinnati Physicians.  Despite his position at the top of a hierarchy of healthcare facilities and physicians, he was unable to secure the integrated behavioral, addiction medicine and physical health care that Alan needed.  This experience inspired him to develop a treatment model that would have benefitted Alan and would be accessible to a wide group of patients.  Dr. Stern moved to Tennessee as Executive Dean and Vice-Chancellor of Health Affairs in 2011.  Soon thereafter, he formed the Center for Addiction Science.  This Center developed a fellowship program in addiction medicine that trained Drs. Hamm and Blackstock.  The Center received the first designation as “Center of Excellence” from The Addiction Medicine Foundation in 2016. Dr. Stern was invited to a White House meeting in Washington DC to discuss the model of care employed by the Center. In October, 2018, he presented the evolution of this model to the Senate Presidents Forum (of State Legislatures).  He continues to give presentations in the mid-South and throughout the USA.  Dr. Stern was joined by Drs. Hamm and Blackstock in forming IAC – it is a joint partnership and a physician-owned and operated company.  Obtaining the best outcomes for IAC patients is the mantra of IAC.