Hogan was a lawyer who co-founded the firm of Hogan & Hartson in 1904 and served as president of American Bar Association (ABA) from 1938 to 1939.
He represented several high-profile clients, including former president Warren G.
Harding, oil tycoon Edward L.
Doheny, and banker Andrew Mellon.
As ABA president he created the association's Committee on the Bill of Rights and supported the controversial Walter-Logan bill.
In 1938, Hogan denounced racial and religious intolerance in a half-hour speech aimed at fellow Catholics; the speech was aired on the same 34 radio stations used by the notoriously antisemitic priest, Charles Coughlin, immediately following Coughlin's regular broadcast.