Dave O'Brien was an American film actor, director and writer. Born David Poole Fronabarger in Big Spring, Texas, O'Brien started his film career in bit parts before gradually winning larger roles, mostly in B pictures.
O'Brien became familiar to movie audiences in the 1940s as the hero of the famous MGM comedy short film series Pete Smith Specialties narrated by Pete Smith. O'Brien wrote and directed many of these subjects under the name David Barclay.
He also appeared in many low-budget Westerns, often billed as 'Tex' O'Brien, alluding to his home state. To modern audiences, he is most likely best to be remembered as a frantic dope addict in the low-budget exploitation film Reefer Madness, yelling "Play it faster, play it faster!!" to a piano-playing girl. He appeared in Queen Of The Yukon as Bob Adams.
In 1942, O'Brien starred in the movie serial Captain Midnight.