Faculty Bios

Marti Witherow


Marti Witherow is a licensed marriage and family therapist, a licensed professional counselor and a certified sex therapist. She serves in a supervisory role for ABCST, educating and supervising therapists working towards their sex therapy board certifications.

Michael Sytsma


Dr. Michael Sytsma is a licensed professional counselor in the state of Georgia, a certified sex therapist, and a certified professional counselor supervisor. He loves to teach and is a frequent presenter at professional conferences, couples retreats and workshops, and serves as professor in several graduate schools across the U.S.

Scott Symington, Ph.D.

Dr. Scott Symington is a clinical psychologist and well-known expert in the treatment of anxiety disorders. His book, Freedom from Anxious Thoughts and FeelingsA Two-Step Mindfulness Approach for Moving Beyond Fear and Worry, was released by New Harbinger Publications in February 2019.

Barry McCarthy, Ph.D.

Dr. Barry McCarthy is a professor of psychology at American University, a diplomate in clinical psychology, a diplomate in sex therapy, and a certified couple therapist.

Nancy Wonder, Ph.D.

Dr. Nancy Wonder works in a private practice in Tallahassee, Florida as a Florida Licensed Psychologist conducting psychotherapy for individuals and couples. She has specialized in sexual trauma and addiction in her career.

Robert Moss, Ph.D.

Dr. Robert Moss is a Clinical Neuropsychologist with 40 years of experience both in clinical research, patient evaluation, diagnosis and therapeutic treatment. He has worked extensively both in hospital and private practice settings treating patients with various neuropsychological problems, specializing in pain management.