Ghost

David Carreon, MD, is a psychiatrist, neuroscientist, and CEO and co-founder of Acacia Clinics. His work brings clinical care, research, and writing together around mental health, the brain, and human flourishing. At Acacia Clinics in Sunnyvale, California, he specializes in advanced brain stimulation for treatment-resistant depression.

The clinic reports that many patients recover within days after years of unsuccessful treatment. Carreon is also a principal investigator on an active NIH-funded study, and his research has appeared in the American Journal of Psychiatry, Nature Neuroscience, and Neuropsychopharmacology. His work has received more than 2,200 citations on Google Scholar.

Through his website, he shares research and publishes Ghost & Machine, a publication exploring artificial intelligence, consciousness, alignment, AI in therapy, philosophy of mind, and human flourishing. He is the author of The Opposite of Depression, published by Tyndale in 2024, which reflects on what he learned from severely ill patients about flourishing. The site also provides information for patients, research updates, writing, and contact details