David L Henderson MDDavid L. Henderson, MD, is a board-certified psychiatrist, author, and speaker. He is the founder and president of Four Stones Collaborative, a mental health consulting practice in Dallas, Texas, where he counsels adolescent and adult clients.In addition, he serves on the board of directors for Drug Prevention Resources, Inc., a nonprofit organization dedicated to preventing youth substance abuse. www.DrDavidHenderson.com. Read More Read Less