Question: Who was the actor in the 1979 film Firepower, who was known to often co-star with his wife Anne Jackson ?

Context articles: Sam's Son
Lovers and Other Strangers
The Tiger Makes Out
Eli Wallach
Firepower (film)
Anne Marie Miller
Frank Warner (folklorist)
Independence (1976 film)
How to Save a Marriage and Ruin Your Life
Eric Douglas

Sam's Son is a 1984 American semi-autobiographical coming-of-age drama film written and directed by Michael Landon loosely based on his early life and is also the only feature film ever made by him.
 The film stars Eli Wallach, Anne Jackson, Timothy Patrick Murphy, Hallie Todd, Jonna Lee, James Karen, and even Landon in a cameo at the beginning and the end.
 The film was produced independently by Landon himself and released by Utah-based distributor Invictus Entertainment.
Lovers and Other Strangers is a 1970 comedy film based on the play by Renée Taylor and Joseph Bologna.
 The cast includes Richard S. Castellano, Gig Young, Cloris Leachman, Anne Jackson, Beatrice Arthur, Bonnie Bedelia, Michael Brandon, Harry Guardino, Anne Meara, Bob Dishy, Marian Hailey, Joseph Hindy, and, in her film debut, Diane Keaton.
 Sylvester Stallone was an extra in this movie.
 The film was nominated for three Academy Awards (it won the Academy Award for Best Original Song), and was one of the top box office performers of 1970.
 It established Richard S. Castellano as a star (receiving an Oscar nomination for his performance) and he, along with Diane Keaton, was subsequently cast in "The Godfather".
 The song "For All We Know" was composed by Fred Karlin with lyrics by Robb Royer and Jimmy Griffin.
The Tiger Makes Out is a 1967 American comedy film about a kidnapper and his unintended victim, starring Eli Wallach and Anne Jackson and directed by Arthur Hiller.
 Making a brief appearance is Dustin Hoffman in his film debut.
Eli Herschel Wallach ( ; December 7, 1915 – June 24, 2014) was an American film, television and stage actor whose career spanned more than six decades, beginning in the late 1940s.
 Trained in stage acting, which he enjoyed doing most, he became "one of the greatest 'character actors' ever to appear on stage and screen" states TCM, with over 90 film credits.
 On stage, he often co-starred with his wife, Anne Jackson, becoming one of the best-known acting couples in the American theater.
 As a stage and screen character actor, Wallach had one of the longest careers in show business, spanning 62 years from his Broadway debut to his last major Hollywood studio movie.
Firepower is a 1979 British thriller film directed by Michael Winner and starring Sophia Loren, James Coburn, O. J. Simpson and Eli Wallach.
 It was the final film in the career of actor Victor Mature.
 The film was received negatively by most critics due to a convoluted plot, though the lead performances and filming locations were generally praised.
Anne Marie Miller is an American public speaker and author who writes on topics such as faith, sexuality and psychology.
 She was previously known as Anne Jackson.
Francis M. "Frank" Warner (April 5, 1903 – February 27, 1978) was an American folk song collector, singer, musician, and YMCA executive.
 He and his wife Anne Warner (born Elizabeth Anne Locher, October 18, 1905 – April 26, 1991) collected and preserved many previously unpublished traditional song versions from the eastern United States, including "Tom Dooley", "He's Got the Whole World in His Hands", "The Days of Forty-Nine", and "Gilgarrah Mountain", a New Hampshire version of the song more widely known as "Whiskey in the Jar".
Independence is a 1976 docudrama film directed by John Huston and starring Eli Wallach, Pat Hingle and Anne Jackson.
 E.G. Marshall narrates.
How to Save a Marriage and Ruin Your Life is a 1968 film directed by Fielder Cook.
 It stars Dean Martin, Stella Stevens and husband and wife Eli Wallach and Anne Jackson.
Eric Anthony Douglas (June 21, 1958 – July 6, 2004) was an American actor and stand-up comedian.
 Douglas was the youngest son of actor Kirk Douglas and his second wife Anne Buydens.
 His half brother was actor and producer Michael Douglas.