Walsh was trained as a lawyer, but began his career with the Los Angeles Herald as a reporter and cartoonist.

[2] His writers included Ford C. Frick, Damon Runyon, Bozeman Bulger, and Gene Fowler, among others.

[2] The players Walsh represented included Ruth, Ty Cobb, Dizzy Dean, Rogers Hornsby, John McGraw, Walter Johnson,[1] and Lou Gehrig.

Besides becoming a delivery boy to meet Ruth, Walsh pursued Walter Johnson into the Pullman's washroom in New Haven, Connecticut.

The second short film was Carry On (1931), with Walsh as narrator mourning the death of Rockne who died in a plane crash in March 1931.

When Ruth died in August 1948, Walsh was named one of the 57 honorary pallbearers at his funeral which was held in St. Patrick's Cathedral in New York City.