Crowley served as Assistant Michigan Attorney General from January 13, 1913, to November 1, 1916.

Crowley served as Michigan Railroad Commissioner from November 10, 1916, until his resignation in January 1917.

[3] Crowley served as special counsel for Detroit in public utility matters from 1918 to 1933.

[2][1] After the resignation of Michigan Attorney General Harry S. Toy, Crowley was appointed by Governor Frank Fitzgerald to fill the vacancy.

[1] Crowley was a member of the Detroit Athletic Club, the Knights of Columbus, and the Elks Lodge.