John Mack was a prominent American psychiatrist and author, best known for his work in the field of psychiatry and his studies on alien abduction experiences. He served as a professor at Harvard Medical School and was a respected figure in the mental health community. His research focused on understanding the psychological impact of these experiences on individuals. Mack gained significant attention for his book, "Abduction: Human Encounters with Aliens," published in 1994. In this work, he explored the accounts of people who claimed to have been abducted by extraterrestrial beings. His approach combined clinical analysis with a compassionate understanding of the experiences, sparking both interest and controversy in the fields of psychology and ufology.