About Us

Mr. Schuyler Cunningham, MSW, LICSW, LCSW-C, BCD
Mr. Schuyler C. Cunningham, MSW, LICSW, LCSW-C, Board Certified Diplomat is an expert ADHD practitioner. He specializes in assessments, evaluations, and treatment.  He also trains other mental health providers in ADHD assessment and treatment at the Center. In addition to founding the Center for Neurocognitive Excellence, he currently practices at the National Institutes of Health in Bethesda, MD, where he chairs the Research Committee for the Social Work Department and provides counseling to people being treated at the Clinical Center. Additionally, he is certified in Eye Movement Desensitization and Reprocessing (EMDR) and uses neurofeedback as well as a variety of other approaches to create safe and individualized care for each client. He is a sought after speaker and has published on various aspects of mental health counseling. Mr. Cunningham obtained his Masters in Social Work from the National Catholic School of Social Service at the Catholic University of America and holds advanced social work licenses in both DC and Maryland.

Ms. Sarah Katherine Nix Tipler, MSW, LICSW, LCSW-C
Senior Therapist

Ms. Sarah Katherine Nix Tipler, or “Kaki” for short, MSW, LICSW, LCSW-C, is a clinical social worker with experience treating ADD/ADHD and related mental health issues in adolescents, adults, and couples. Kaki has worked in hospitals and other medical treatment centers, as well as in university and high school counseling centers. Kaki is trained in neurofeedback and Cognitive Behavioral Therapy (CBT) and uses an integrative approach to treatment. She has held positions at several different eating disorder treatment centers and helped found the University of the South’s Sexual Assault Crisis Response Team. In addition to her work at the Center for Neurocognitive Excellence, she is a Senior Staff Clinician and Eating Disorder Services Coordinator at The George Washington University’s Mental Health Services at the Colonial Health Center. Kaki obtained her Master of Social Work from the School of Social Policy and Practice at The University of Pennsylvania and is a Licensed Independent Clinical Social Worker in DC and Maryland.

Dr. Shira Gottlieb, PsyD.
Clinical Psychologist

 Dr. Shira Gottlieb is a licensed clinical psychologist who specializes in counseling and comprehensive evaluations for children, adolescents, and adults with ADHD. Her individualized assessments target client’s unique strengths as well as educational, behavioral, and emotional challenges. With regard to therapy, Shira utilizes an integrative approach, incorporating Cognitive Behavioral Therapies (CBT), Dialectical Behavioral Therapy (DBT), and Family Systems techniques. Shira’s experience includes conducting evaluations and counseling in hospitals, schools, residential and day mental health treatment centers, and private group practices. Shira obtained her doctorate degree in psychology from George Washington University and her bachelor’s degree from Harvard University. She is licensed to practice psychology in D.C. and Virginia.

Ms. Mali Jimenez, MSW, LGSW

 Ms. Mali Jimenez, MSW, LGSW, is a licensed graduate social worker in DC and Maryland and has experience treating children, adolescents, and adults with ADHD in both Spanish and English. She brings over 20 years of mindfulness meditation experience and incorporates many mindfulness techniques into her work, especially to help people build the capacity of their executive functioning skills. In addition to working at the Center for Neurocognitive Excellence, she works as a school-based mental health therapist where she treats many children with ADHD diagnoses, anxiety, and depression. Before joining the Center Ms. Jimenez worked at the Veterans Administration and the Latin American Youth Center in DC. Mali understands the the intersection between family structural dynamics, past trauma and, attention deficit disorders. Ms. Jimenez obtained her Master in Social Work from the University of Maryland School of Social Work and holds an LGSW in both DC and Maryland.

Mr. Bar Lehmann, MSW, LICSW

 Mr. Bar Lehmann, MSW, LICSW uses a holistic integrative approach to treat ADD/ADHD, trauma, depression, anxiety, and emotional distress. He has experience using neurofeedback (pursuing BCIA Certification in neurofeedback), cognitive-behavioral therapy, and treating trauma (TREM Training). Bar also has experience conducting evaluations and assessments, and currently provides ADHD assessments. His experience includes psychotherapy, supervising and mentoring fellow clinicians, and facilitating men’s trauma groups at Community Connections, a mental health clinic in DC. He also has done research on co-occurring mental health and substance use disorders with the Addictions Research Institute at the University of Texas at Austin. Bar also has serious interests in literature, philosophy, meditation, and health. He obtained his Masters in Social Work through the University of Texas at Austin.

Ms. Rachelle Davila
Client Care Coordinator

Ms. Rachelle Davila has over 10 years experience working with people in the medical and mental health fields. Her experience includes providing medical care to patients as a Certified Medical Assistant and office support for large practices and nationally recognized community health centers. Before joining The Center for Neurocognitive Excellence, Ms. Davila launched the mental health social media campaign focused on providing access to care for families with low incomes through the Stephen F. Austin Community Health Network. Ms. Davila obtained her CMA certification from the Texas School of Business in Friendswood, TX. She speaks both English and Spanish fluently.


“My work with Schuyler was invaluable – one might say transformative. His presence is open, welcoming and safe; and his skill and insightfulness are spot on. He has my deepest gratitude and highest recommendation.”


“My experience with Schuyler was a great experience. I felt comfortable, at ease and very connected. Schuyler was very easy to talk to and was great at making me feel non judged.”