Staying at The Journal for ten years, he moved from sports to the police beat to finally become the paper's star reporter.

[1] After a stint at the New-York Tribune in 1917, in 1918–1919 he went to the battlefields of France to cover the Great War for The Atlanta Journal from the perspective of Georgian troops.

Greene's "Happy Dan, the Cynical Dog" (Cosmopolitan magazine, 1945)[7] was the basis for Walt Disney's animated film Lady and the Tramp (1955).

[8] King Features immediately spun off "Scamp," a minor unnamed character from the movie, into his own comic strip, written by Greene and illustrated by Dick Moores.

[citation needed] A resident of Westwood, New Jersey, Greene died in Havana, Cuba, of a pulmonary edema brought on by pneumonia while en route to a family vacation in California.