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Compassionate, Experienced, Multidisciplinary Care

Our experienced, multidisciplinary team of specialists led by Dr. Stacy Seikel, MD, provides the most comprehensive treatment program for lasting recovery.

Stacy Seikel, MD

Medical Director

Stacy Seikel, MD, is the Medical Director for Atlanta Addiction Recovery Center (AARC). Board-certified in addiction medicine and anesthesiology, Dr. Seikel is a national leader in addiction treatment, including medication-assisted treatment (MAT) for opioid addiction, and dual diagnosis treatment.

Dr. Seikel believes in being a strong patient advocate. She has worked on the state and national levels to develop programs to keep families intact while a parent achieves recovery and sobriety. She serves as a professional mentor, and is involved in state level efforts in Georgia to educate lawmakers about the disease of addiction and the need to improve access to addiction treatment for those struggling with alcoholism, drug addiction and pain medication addiction.

Daniel Lettenberger-Klein, MS, LMFT

Executive Director

Daniel Lettenberger-Klein, MS, LMFT, is Executive Director of Atlanta Addiction Recovery Center (AARC), where he oversees business operations, recovery programming and clinical processes related to patient care. Daniel received his Bachelor of Science in Psychology from Bradley University and his Master of Science in Marriage and Family Therapy from Purdue University.

Catherine Baer, MS, MS, LPC

Clinical Director

Catherine Baer, MS, MS, LPC, serves as Clinical Director of Atlanta Addiction Recovery Center (AARC). A Licensed Professional Counselor with over 20 years of experience in the addiction treatment and mental health fields, Catherine has earned a reputation for ensuring compassionate, quality care.

One of her greatest passions is working with family members, equipping loved ones to be a support system vital to a patient’s sustained recovery. Catherine earned a Master of Science in Counseling from Georgia State University and a Master of Science in Psychology from University of Georgia.

Ashley Buffington, LPC, MS

Lead Therapist

Ashley Buffington is a Licensed Professional Counselor in Georgia and Lead Therapist for Atlanta Addiction Recovery Center (AARC). Ashley received her Bachelor of Science in Psychology at Palm Beach Atlantic University with an emphasis on Christian counseling, and her Master of Science in Community Counseling from Mercer University in Atlanta, GA. She went on to complete a two-year program called Contemplative Leaders in Action through Ignatius House Jesuit Retreat Center in 2016. Ashley’s passion for integrating therapy and spirituality drives her practice. She has counseling experience in the areas of substance abuse, anxiety disorders, depression, trauma, adjustment disorders, anger management, grief and spiritual concerns. 

David Hopkins, LPC, MS


David Hopkins is a Licensed Professional Counselor and Therapist at Atlanta Addiction Recovery Center (AARC). David received his undergraduate degrees in Ministry and Psychology, and Master of Science in Mental Health Counseling from Palm Beach Atlantic University in West Palm Beach Florida. He is an Internationally Certified Alcohol and Drug Counselor (ICADC) and has been working as a clinician in the field of substance abuse and co-occurring disorders for over eight years.

David is certified in EMDR, a breakthrough therapy that assists clients in overcoming trauma, anxiety, post-traumatic stress disorder and many other conditions. His training also includes solution-focused brief therapy (SFBT), Gestalt therapy, and cognitive behavioral therapy (CBT).  He leads the worship, scripture study, men's groups and weekly aftercare groups at AARC, focusing on effective therapeutic solutions so that his clients can heal past wounds and resume their lives more fully engaged.

Paige McBryar, MSN, RN, FNP-BC

Nurse Practitioner

Lisa “Paige” McBryar, MSN, RN, FNP-BC, is a Nurse Practitioner at Atlanta Addiction Recovery Center (AARC). Board-certified as a Family Nurse Practitioner by the American Academy of Nurse Practitioners, Paige is highly skilled in psychiatric medication management and is passionate about helping patients with substance use disorders and co-occurring psychiatric disorders. She is pursuing a post-master's, advanced practice nursing specialty certification in Psychiatric Mental Health Nursing at Georgia State University School of Nursing. A longtime member of First Baptist Church Atlanta, she volunteers at the children's church teaching worship arts and drama for elementary school kids.

Randy Eberhard

Recovery Counselor and Weekly Ministry Group Lead

Randy Eberhard is a Recovery Counselor and leader of the Weekly Ministry Group at Atlanta Addiction Recovery Center (AARC). Randy is currently pursuing a Master’s degree in Christian Psychology from Richmont Graduate University in Atlanta. He is also pursuing training to become a Certified Alcohol and Drug Counselor through the IC-RC international certification board. Randy has worked with countless adults, adolescents and their families with an emphasis on addiction and recovery. He has been a featured speaker to a variety of organizations, schools, and churches throughout the Atlanta area. Randy received training in family recovery, orientation and regeneration through various organizations, including No Longer Bound in Cumming, Georgia and The Waypoint Center in Dahlonega, Georgia. In his ministry, Randy focuses on conflict resolution and relapse prevention, as well as general issues involving substance abuse and addiction to encourage and inspire his clients in their recovery.

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