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During the 1960s and 1970s, Pratt became a staple on television with appearances on a variety of series. In 1966 he appeared on the only color episode of ''Perry Mason.'' He was cast as theatre director Tom Loman in ''The Case of the Twice-Told Twist," as theater director Tom Loman. Other television appearances included ''Father Knows Best,'' ''Hotel de Paree,'' ''The Man from Blackhawk,'' ''Overland Trail,'' ''The DuPont Show with June Allyson,'' ''[[Klondike (TV series)|Kondike]]'', ''Bronco,'' Saints and Sinners,'' ''The Iron Horse,'' ''That Gir,'' ''Circle of Fear,'' ''S.W.A.T.,'' ''Charlie's Angels,'' and ''The Quest.''

During the 1960s and 1970s, Pratt became a staple on television with appearances on a variety of series. In 1966 he appeared on the only color episode of ''Perry Mason.'' He was cast as theatre director Tom Loman in ''The Case of the Twice-Told Twist," as theater director Tom Loman. Other television appearances included ''Father Knows Best,'' ''Hotel de Paree,'' ''The Man from Blackhawk,'' ''Overland Trail,'' ''The DuPont Show with June Allyson,'' ''[[Klondike (TV series)|Kondike]]'', ''Bronco,'' Saints and Sinners,'' ''The Iron Horse,'' ''That Gir,'' ''Circle of Fear,'' ''S.W.A.T.,'' ''Charlie's Angels,'' and ''The Quest.''

He also made multiple appearances on western series including ''This Man Dawson,'' ''Cain's Hundred,'' ''Laramie,'' ''[[Outlaws (1960 TV series)|Outlaws]],'' ''Gunsmoke,'' ''Rawhide,'' ''Death Valley Days,'' Slattery's People,'' ''Daniel Boone,'' ''The Virginian,'' and ''Bonanza.'' Pratt also had multiple roles on dramas and comedies including ''Bracken's World,'' ''Mayberry RFD,''  ''Kojak,'' ''Walt Disney's  Wonderful World of Color, and ''Police Story.''

He also made multiple appearances on western series including ''This Man Dawson,'' ''Cain's Hundred,'' ''Laramie,'' ''[[Outlaws TV series)|Outlaws]],'' ''Gunsmoke,'' ''Rawhide,'' ''Death Valley Days,'' ''Slattery's People,'' ''Daniel Boone,'' ''The Virginian,'' and ''Bonanza.'' Pratt also had multiple roles on dramas and comedies including ''Bracken's World,'' ''Mayberry RFD,''  ''Kojak,'' ''Walt Disney's  Wonderful World of Color, and ''Police Story.''

In addition to his extensive work in television, Pratt also had roles in numerous film during the 1960s including ''The Rise and Fall of Legs Diamond'' (1960), ''Kid Galahad'' (1962), starring [[Elvis Presley]], ''The Ugly American'' with Marlon Brando, ''Cheyenne Autumn'' (1964), and ''The Computer Wore Tennis Shoes'' (1969). In the 1970s, Pratt had roles in ''The Barefoot Executive'' (1971), ''Futureworld,'' ''Vigilante Force,'' starring Kris Kristofferson and Jan-Michael Vincent. Pratt's final film role was in the 1978 drama film ''F.I.S.T.],'' starring Sylvester Stallone. In the film, Pratt portrayed Stallone's character's attorney. Pratt made his final on-screen appearance a 1980 episode of Jack Klugman's ''Quincy, M.E.''

In addition to his extensive work in television, Pratt also had roles in numerous film during the 1960s including ''The Rise and Fall of Legs Diamond'' (1960), ''Kid Galahad'' (1962), starring [[Elvis Presley]], ''The Ugly American'' with Marlon Brando, ''Cheyenne Autumn'' (1964), and ''The Computer Wore Tennis Shoes'' (1969). In the 1970s, Pratt had roles in ''The Barefoot Executive'' (1971), ''Futureworld,'' ''Vigilante Force,'' starring Kris Kristofferson and Jan-Michael Vincent. Pratt's final film role was in the 1978 drama film ''F.I.S.T.],'' starring Sylvester Stallone. In the film, Pratt portrayed Stallone's character's attorney. Pratt made his final on-screen appearance a 1980 episode of Jack Klugman's ''Quincy, M.E.''