Ruben Moreira was born in Fajardo, Puerto Rico and moved with his mother to New York City when he was four.
In his twenties he began his career in the world of comics, but before that he studied at Cooper Union, Pratt Institute and the Grand Central School of Art.
He started working for Fiction House's Planet Comics on Reef Ryan in July 1942.
A Rubimor Sunday page is part of the Library of Congress American Treasures collection.
[4] Moreira is credited with creating at least three characters: Black Terror, Puzzler and Beggar King.