Chris Cooper

 portrayed Al Templeton, who owns a diner in Lisbon, Maine. He convinces his good friend, Jake Epping, to go back in time to stop the assassination of John F. Kennedy.

Biography
Christopher Walton Cooper was educated at the University of Missouri School of Drama. He appeared on Broadway in "Of the Fields Lately" (1980), and off-Broadway in "The Ballad of Soapy Smith" (1983) and "A Different Moon" (1983). He debuted in films in the John Sayles movie "Matewan" (1987). On television, Cooper has been featured in the mini-series "Lonesome Dove" (1989) and "Return to Lonesome Dove" (1993), as July Johnson. He has also appeared in a number of television movies.

Trivia
Cooper was twelve years old when Kennedy was assassinated.

Source
Chris Cooper on the Internet Movie Database. Retrieved on April 2, 2019.