Peter A. Levine, PhD, has spent 50 years studying and treating stress and trauma. He holds a doctorate degree in medical biophysics from the University of California at Berkeley and in psychology from International University. He is the developer of Somatic Experiencing, a naturalistic approach to healing trauma. He has practiced and taught at treatment centers, hospitals, and pain clinics throughout the world, and has dealt with a wide range of trauma, including accidents, rapes, assaults, abuse, and invasive medical procedures. He is the bestselling author of Waking the Tiger (published in 22 languages), as well as several other books and audio programs that teach people how to use the body as a tool in resolving trauma.