In which date did the TV show on which Stephen Tobolowsky had the role of Action Jack Barker premier ?
Stephen Tobolowsky:  He is known for film roles such as annoying insurance agent Ned Ryerson in "Groundhog Day" and amnesiac Sammy Jankis in Christopher Nolan's "Memento", as well as such television characters as Commissioner Hugo Jarry ("Deadwood"), Bob Bishop ("Heroes"), Sandy Ryerson ("Glee"), Stu Beggs ("Californication"), and Action Jack Barker ("Silicon Valley"). Silicon Valley (TV series):  The series premiered on April 6, 2014 on HBO.
April 6, 2014