Leonard Keene Hirshberg (January 9, 1877 – October 1, 1969) was an American physician and popular medical writer who was convicted of mail fraud.

[1][2][3] He had a successful career as a health writer, with his articles appearing in mainstream medical columns and journals.

[7] In 1913, he resigned from the Baltimore County Medical Society while under investigation for magazine articles that stated incorrectly that cures had been discovered for cancer and leprosy.

In December 1923, the New York World reported that he claimed to have developed a means to eradicate boll weevils, and was researching abnormal psychology by observing his fellow prisoners.

[10] Fulton Oursler wrote in his autobiography that in Baltimore, Hirshberg researched his articles in the library with beautiful young "stenographers", and that because of his wife's complaints, an indictment in Maryland had to be quashed through the intervention of William Randolph Hearst after a request from Marion Davies before Hirshberg could be released on Oursler's recognizance.