Marshall's most memorable role was as the host and announcer of the anthology television drama series Suspense from 1949–1954.

Drafted into the Army, Marshall was a pilot instructor for the Army Air Corps at the beginning of World War II;[3] later in the war, he flew the amphibious PBY in the Pacific theater, attaining the rank of captain.

In 1949, Marshall left his employment at WPIX-TV to work as a freelance advertising spokesman.

During 1950-51, Marshall was the second announcer on the game show Blind Date, (also known as Your Big Moment).

He was also the announcer for the sports broadcast The Herman Hickman Show during its one-season run in 1952-53.

In 1965, Marshall purchased an existing AM radio property, WVTR, licensed to operate at White River Junction, Vermont.

During the run of Suspense, Marshall endorsed Auto-Lite spark plugs, which sponsored the program.

He was seen in live network television commercials in Reynolds-sponsored programs such as Mister Peepers, which ran between 1952 and 1955.

[2] On Tuesday, March 8, 1983, Marshall was sitting at his desk at WNHV, the station that he had owned for 18 years, in White River Junction, Vermont when, suddenly, he suffered a heart attack.

Marshall was survived by his wife Barbara, his four children, his sisters Valrie and Hermione, and his mother.