Dr. Christopher Ryan is an American author best known for co-authoring the book Sex at Dawn. He received a B.A. in English and American literature in 1984 and an M.A. and Ph.D. in psychology from Saybrook University, an accredited hybrid low-residency/online learning program based in San Francisco twenty years later. His masters thesis examined differences in specific personality measures between working fashion models and the general public. 

Dr. Ryan gave a TED talk in February 2013, contributes to Psychology Today and has an interview podcast called Tangentially Speaking with Dr. Christopher Ryan.

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