Donald Hood "Don" Keefer (August 18, 1916 – September 7, 2014) was an American actor known for the versatility of his roles. He was born in Highspire in Dauphin County near Harrisburg, Pennsylvania. A founding member of The Actors Studio, Keefer's film debut was as Bernard in the 1951 film, Death of a Salesman, based on the Arthur Miller play. His longest-lasting roles were in ten episodes each of the CBS series, Gunsmoke, starring James Arness, and Angel, a 1960-1961 sitcom featuring French-American actress Annie Fargé.
Keefer appeared in dozens of television series, including the early anthologies, Fireside Theatre, Armstrong Circle Theatre, The Philco Television Playhouse, the United States Steel Hour, Alcoa Presents: One Step Beyond, and The DuPont Show with June Allyson. In 1957, Keefer appeared as McNair in the episode "Ito of Attu" of ABC Navy Log. That same year, he appeared with David Janssen as the character "Reagan" in "Big Score" of the CBS series, Richard Diamond, Private Detective. In 1958, he appeared as Ed Locke in the episode "Wild Green Yonder" of the syndicated crime drama State Trooper, starring Rod Cameron. In 1959, Keefer appeared as John Alastair in the episode "Death Is a Red Rose" of the Craig Stevens NBC crime drama Peter Gunn. Keefer was cast three times on CBS's anthology, Alfred Hitchcock Presents, as Dr. Elkins in "The Indestructible Mr. Weems" (1957), as Pete Williams in "The Percentage" (1958), and as a tax clerk in "The Kiss-Off" (1961). He had small roles in some feature films, including Sleeper.
Keefer appeared as Cromwell in the 1968 episode "Assignment: Earth" of the NBC science fiction series Star Trek. Earlier, he was cast in three episodes of CBS's The Twilight Zone: as Dan Hollis in "It's a Good Life" (1961), as Spiereto in "Passage on the Lady Anne" (1963), and Fred Danziger in "From Agnes - With Love" (1964).
On May 7, 1950, Keefer married the former Catherine McLeod (July 2, 1921—May 11, 1997), formerly of Texas. At the time of her death, the Keefers were living in Sherman Oaks in the San Fernando Valley of Los Angeles County, California. There are three Keefer sons, Donald McLeod, John H., and Thomas James. He died at the age of 98 on September 7, 2014.