George Callahan

This Island Earth

Screenplay

Charlie Chan in the Secret Service

Writer

The Scarlet Clue

Writer

Dark Alibi

Screenplay

Red Light

Screenplay

Black Magic

Screenplay

Charlie Chan in The Chinese Cat

Story

Charlie Chan in The Jade Mask

Writer

The Shanghai Cobra

Screenplay / Original Story

Step by Step

Story

Bunco Squad

Screenplay

The Babe Ruth Story

Screenplay