Maxwell Grant was a pen name used by the authors of The Shadow pulp magazine stories from the 1930s to 1960s.
[1][2] Street & Smith, the publishers of The Shadow, hired author Walter B. Gibson to create and write the series based on popular interest in the character who was first used as a radio narrator.
The pen name was used primarily so numerous authors could write the stories without confusing readers.
Another factor was how Gibson, also a nonfiction writer, wanted to use a pen name for his fiction.
The comic book series The Shadow: Year One, published by Dynamite Entertainment, features a character by the name of "Maxwell Grant".