Christopher Ryan, Ph.D. is a psychologist, speaker, and author of New York Times best seller "Sex At Dawn" and he also hosts a podcast called "Tangentially Speaking".Christopher Ryan, Ph.D. is a psychologist, speaker, and author of New York Times best seller "Sex At Dawn" and he also hosts a podcast called "Tangentially Speaking".Christopher Ryan, Ph.D. is a psychologist, speaker, and author of New York Times best seller "Sex At Dawn" and he also hosts a podcast called "Tangentially Speaking".