Richard Henry Benson, who fought crime as the pulp hero known as The Avenger, appeared in a series novels credited to "Kenneth Robeson", and mostly written by his creator, Paul Ernst.
Benson was a globe-trotting millionaire adventurer whose life was shattered when his wife and daughter were killed. His hair turned white, and his face became paralysed (although this eventually wore off) in a manner that rendered the flesh malleable, so he could adopt different appearances.
In Doc Savage: His Apocalyptic Life, Philip José Farmer identifies Benson's parents as Wold Newton Family member Isis Fogg, and a wealthy American called Benson. Eminent pulp scholar Jess Nevins has found this Benson to be the man whose killing was investigated by Philo Vance in The Benson Murder Case.