 McCullough first came to public notice in 1934 with "Aces Made Easy – or Pons asinorum in a nutshell", which he wrote with illustrations by Fougasse.This was a humorous look at the game of contract bridge, which was then very fashionable in England.He followed this the following year with "You Have Been Warned – A Complete Guide to the Road" an equally humorous book with the same illustrator.