|Years active||1964–1972 (as actor)|
|Height||6 ft 4 in (193 cm)|
Ewing is best remembered for his characterization of part-time deputy marshal Clayton Thaddeus "Thad" Greenwood in thirty-six episodes (October 2, 1965 - September 25, 1967) of the long-running CBS western television series Gunsmoke with James Arness.
In his first episode "Clayton Thaddeus Greenwood", Ewing's character arrives in Dodge City, Kansas, the location of the series, from Oklahoma with a warrant he is unable to execute. Among Ewing's last Gunsmoke appearances were on episodes entitled "The Prodigal", "Nitro" (Parts 1 and 2), "Ladies from St. Louis" and "Mistaken Identity". Before he was cast as Thad, Ewing appeared on Gunsmoke once in the role of Ben Lukens in the episode "Song for Dying", which aired on February 13, 1965.
Ewing's first television appearance was in 1964 as Marvin Grogan on ABC's sitcom Bewitched in the episode "The Girl Reporter". He also appeared that season as Eddie Fox in the episode "The Christmas Show" of ABC's short-lived The Bing Crosby Show, starring Bing Crosby and Beverly Garland, and in a third sitcom as well in the role of Norman in the episode entitled "Look Who's a Sailor" on CBS's short-lived The Baileys of Balboa.
In 1965, Ewing, at twenty-three, appeared as Private Swensholm in the World War II film None but the Brave starring Frank Sinatra and Clint Walker. That same year, he appeared as Billy Wallace in the episode "The Calf Women" of CBS's western Rawhide starring Eric Fleming and Clint Eastwood.
After his Gunsmoke role ended, Ewing appeared in two films: as Donald Maxwell in the western production Smith! starring Glenn Ford (1969) and as Nelson in Play It As It Lays, a psychiatric drama starring Tuesday Weld and Anthony Perkins (1972). Also in 1969, Ewing was a celebrity contestant on an episode of The Dating Game in which the eligible bachelorette was future actress Lindsay Wagner.
In the 1970 episode, "Pioneer Pluck", on the syndicated television anthology series, Death Valley Days, hosted by Dale Robertson, Ewing was cast as Frank Harris, a suitor of the beautiful Anabelle Colvin (Karen Carlson), who flirts with ranch hand Winn Kinkead (Robert Yuro), as she awaits her proposal from Harris. Winn vows revenge when he sees that he has misunderstood Anabelle's intentions.
Ewing's Gunsmoke character was superseded by that of Newly O'Brien, portrayed by Buck Taylor, son of character actor Dub Taylor. After his acting career ended, Ewing returned to his previous work as a photographer.
- Ensign Pulver (1964) - Jackson (uncredited)
- None but the Brave (1965) - Pvt. Swensholm
- Smith! (1969) - Donald Maxwell
- Play It As It Lays (1972) - Nelson (final film role)
- "Roger Ewing Summary". tv.com. Retrieved January 7, 2009.
- "Roger Ewing". www.imdb.com. Retrieved January 7, 2009.
- "Pioneer Pluck on Death Valley Days". Internet Movie Database. Retrieved December 7, 2018.
- "Gunsmoke: Television Cast Member Info". uark.edu. Retrieved January 7, 2009.
- "James Arness: Greetings from Jim", May 2002". jamesarness.com. Archived from the original on June 25, 2008. Retrieved January 7, 2009.