About
, is a board-certified psychiatrist and Diplomate of the American Board of Psychiatry and Neurology. He earned his medical degree from Brown University Warren Alpert Medical School and completed his psychiatry residency at Harvard Medical School. At Harvard, he served as Chief Resident of Student Mental Health and conducted research on non-stimulant treatments for ADHD. His undergraduate degree comes from the University of Notre Dame.
Dr. Nissen holds certification as a CBT Therapist through the Feeling Good Institute and trained as a cognitive behavioral and exposure therapist at the Boston University Center for Anxiety and Related Disorders. He specializes in ADHD, anxiety disorders, treatment-resistant depression, substance use disorders, and young adults navigating the transition to adulthood. His interventional psychiatry training includes ketamine-assisted psychotherapy with Psychedelic Therapy Boston, ketamine infusions, TMS, and Spravato at Massachusetts General Hospital, and MDMA-assisted therapy with MAPS. He hosts the Brain Health with Dr. Nissen podcast and reports for ABC News on sleep, supplements, diet, exercise, and lifestyle interventions for mental health. A husband and father, Dr. Nissen is passionate about helping patients overcome adversity to reach their personal and professional goals.
Education & Training
Undergraduate
University of Notre Dame, Bachelor of Arts (B.A.)
Medical School
Brown University Warren Alpert Medical School, Doctor of Medicine (M.D.)
Residency
Psychiatry, Harvard Medical School
Additional Training
Chief Resident of Student Mental Health, Harvard Medical School; CBT training at Boston University Center for Anxiety and Related Disorders (CARD); Ketamine-Assisted Psychotherapy training with Psychedelic Therapy Boston; Ketamine infusions, TMS, and Spravato training at Massachusetts General Hospital; MDMA-assisted therapy training with MAPS; CBT Therapist certification through the Feeling Good Institute
Certifications
Conditions Treated
Who is Dr. Nissen right for?
Dr. Nissen is a strong fit for adults and young adults managing ADHD, anxiety disorders, or treatment-resistant depression. Patients who have tried stimulant medications and want non-stimulant alternatives will find his research background and clinical focus directly relevant. He also works well with patients dealing with OCD, body-focused repetitive behaviors, insomnia, or substance use disorders like marijuana and nicotine dependence. Executives and high-achieving students seeking performance-oriented health coaching benefit from his weekly virtual coaching program. Patients open to interventional psychiatry, including ketamine, Spravato, TMS, or MDMA-assisted therapy, will find deep expertise in those areas as well.
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Frequently Asked Questions
Dr. Nissen treats ADHD, OCD, generalized anxiety, social anxiety, body-focused repetitive behaviors, phobias, insomnia, treatment-resistant depression, substance use disorders, and dementia. He also works with young adults navigating the transition to adulthood and patients managing nicotine or marijuana dependence.
Yes. Dr. Nissen holds board certification from the American Board of Psychiatry and Neurology. He is a Diplomate of that board. He also holds certification as a CBT Therapist through the Feeling Good Institute.
D. from Brown University Warren Alpert Medical School and completed his psychiatry residency at Harvard Medical School. At Harvard, he served as Chief Resident of Student Mental Health. He trained as a CBT and exposure therapist at Boston University's Center for Anxiety and Related Disorders.
Dr. Nissen focuses on non-stimulant ADHD management. He builds individualized plans combining non-stimulant medications, dietary and supplement strategies, executive functioning skills coaching, and neurocognitive testing tools like COGMED. He researched non-stimulant ADHD treatments during his time at Harvard.
Yes. Dr. Nissen has specialized training in ketamine-assisted psychotherapy, ketamine infusions, Spravato, TMS, and MDMA-assisted therapy. He trained at Massachusetts General Hospital and with Psychedelic Therapy Boston and MAPS. He works with patients who have questions about these options and determines appropriateness on a case-by-case basis.
Dr. Nissen practices cognitive behavioral therapy, exposure and response prevention for OCD and anxiety, habit reversal training for body-focused repetitive behaviors, CBT-Insomnia, and motivational interviewing. He holds certification as a CBT Therapist through the Feeling Good Institute and trained at Boston University's Center for Anxiety and Related Disorders.
Yes. Dr. Nissen runs a health coaching program designed for executives and high-achieving students worldwide. Sessions are weekly, one-on-one, and virtual, with asynchronous support between appointments. The program covers executive functioning, sleep, nutrition, fitness, and behavioral structure.
Dr. Nissen takes a bio-psycho-social approach with every patient. He addresses biological factors like sleep, diet, and medical health; psychological factors like therapy and learning; and social factors like relationships and career. He combines these with goal-setting, accountability checks, and pre- and post-treatment testing to track real progress.
Yes. Dr. Nissen hosts the Brain Health with Dr. Nissen podcast. He also reports for ABC News, covering research on sleep, supplements, diet, exercise, and lifestyle interventions for mental health.
Doctor profile last updated April 10, 2026