His longest-running role was portraying Evans Baker on the CBS daytime soap opera Love of Life for four years.

[2] His roles on Broadway included the police inspector in the drama, A Pin to See the Peep Show (1953), and Dr. Blimber in the comedy Nature's Way (1957).

Long had character roles in 1960s sitcoms, including Get Smart, Hogan's Heroes, I Dream of Jeannie, and Green Acres.

He made three guest appearances on Perry Mason, including the role of title character Arthur Hennings, who, as a former Nazi official, had assumed a new identity, in the 1961 episode, "The Case of the Renegade Refugee."

Other TV appearances include parts on Alfred Hitchcock Presents, Batman (episode 110 in 1967), The Time Tunnel, The Man From U.N.C.L.E., Mission: Impossible, Mannix and Columbo.