Dr. Christopher M. Palmer is a Harvard psychiatrist and researcher working at the interface of metabolism and mental health. He is the Director of the Department of Postgraduate and Continuing Education at McLean Hospital and an Assistant Professor of Psychiatry at Harvard Medical School. For over 25 years, he has worked with people who have treatment-resistant mental illness using standard treatments. He has been pioneering the use of the medical ketogenic diet in the treatment of psychiatric disorders—conducting research in this area, treating patients, writing, and speaking around the world on this topic. More broadly, he is interested in the roles of metabolism and metabolic interventions on brain health. He has developed the first comprehensive theory of what causes mental illness, integrating existing theories and research into one unifying theory—the brain energy theory of mental illness.