Though he was only Jason McGuire and Paul Stoddard in the television
series Dark Shadows (1966) (Sheriff Patterson in the film House of Dark Shadows (1970)), Dennis Patrick
was television's first vampire (as Dennis Harrison) in a 1950 episode
of Stage 13 (1950).
His father's family came from Ireland and many of Dennis' character
roles contained an Irish brogue.
Logged over 1800 guest roles on TV programs during his four-decade
career.
Did voice-over work on many commercials.
His first professional acting appearance was on stage in Surrey, Maine, in a production of 'Harvey'.