Aaron Marc Stein (November 15 1906 – August 29, 1985[1][2]), who used the pen name George Bagby, was an American novelist who specialized in mystery fiction.
[2] His early avant-garde novels came to the attention of Theodore Dreiser and were published, but he did not gain much fame till he moved into writing mysteries.
In addition to Bagby, he also published mystery novels under his own name, and under the pseudonym Hampton Stone.
[2] Over 100 novels by Stein eventually saw publication, and for his lifetime achievements the Mystery Writers of America named him a Grand Master at the 1979 Edgar Awards.
[1] In addition to the hero of most of the Bagby novels, Inspector Schmidt, Stein also created a New York City Assistant District Attorney named Jeremiah Gibson for the books published under the Stone pseudonym, and archaeologist detectives Tim Mulligan and Elsie Mae Hunt, as well as engineer Matt Herridge, for the mysteries published under his own name.