After leaving school, Elman worked as a composer, musician (saxophone and violin), comedian and show hypnotist. He changed his surname from Kopelman to Elman at this time because it fitted better on posters and seemed a better way to enter show business. Together with W. C. Handy, with whom he was friends, he composed the hit “Atlanta Blues (Make Me One Pallet On Your Floor)”.Their songs were also played by Louis Armstrong. Dave Elman also worked as a radio presenter; he was particularly successful from 1937 to 1948 with his radio show Hobby Lobby on KDKA and wrote several books. In addition to his professional activities, Elman worked for the US espionage service CIC from 1942.
So that a charity event didn’t have to be canceled, Elman stepped in to perform an impromptu hypnosis show in 1948. After the show, doctors in attendance asked him to teach them what they had just seen. In 1949, he demonstrated his rapid induction methods and his knowledge of pain control to doctor friends. He was then asked to offer a course on hypnosis for doctors and dentists. He insisted that he was not practicing medicine, but only teaching the techniques of hypnosis. His students often explored other medical applications and these collaborations were incorporated into the course. The medical hypnosis courses were passed on to thousands of doctors and dentists. In 1964 he wrote the highly acclaimed book “Findings in Hypnosis”, which was later republished as HYPNOTHERAPY.