|Date of birth:||May 1, 1900|
|Place of birth:||Olney, Illinois|
|Date of death:||August 3, 1966|
|Place of death:||Dayton, Ohio|
Providence Steam Roller
|Playing stats at|
Jackson Milliman Keefer (May 1, 1900 – August 3, 1966) was an American football player. Keefer attended Steele High School in Dayton, Ohio before enrolling at the University of Michigan. He played halfback for the Michigan Wolverines football team in 1922. Keefer was determined to be ineligible in the fall of 1923 and transferred to Brown University. While playing for Brown, he was selected as a third-team All-American in 1924 by Walter Camp and in 1925 by the Associated Press, Walter Camp and Walter Eckersall. He later played professional football for the Providence Steam Roller in 1926 and the Dayton Triangles in 1928. Keefer also played professional baseball for Springfield in the Eastern League in 1927. Keefer was inducted into the Brown University Athletic Hall of Fame in 1971, and in 2003 was selected as one of four backs on the 125th Anniversary All-Time Brown Football Team. Keefer died in 1966 at age 66 at a Veterans Administration hospital in Dayton, Ohio.
- "1922 Football Team". University of Michigan, Bentley Historical Library.
- "KEEFER OF BROWN IS RATED AS STAR BACK". Appleton Post-Crescent. 1925-11-20.
- "The Telosport". Times Signal. 1925-01-07.
- "Walter Camp Slights Big Three In Naming All-America Eleven: Football Expert Neglects To Name Princeton, Harvard or Yale Man on His First Team". Appleton Post-Crescent. 1924-12-30.
- "Associated Press Announces All-American Teams". Wisconsin Rapids Daily Tribune. 1925-12-14.
- "Syracuse Draws Blank as Rice Names Official All-American Eleven". Syracuse Herald. 1925-12-15.
- "Westerners Lead On All-American: Chicago Critic Picks Team With Strong Aerial Attack". The Galveston Daily News. 1925-12-20.
- "Jack Keefer profile". pro-football-reference.com.
- "SPRINGFIELD SIGNS KEEFER, FORMER 8ROWN OUTFIELDER STAR". Bridgeport Telegram. 1927-04-02.
- "BROWN'S TOP 50 FOOTBALL PLAYERS OF ALL-TIME VOTED TO 125TH ANNIVERSARY TEAM". Brown Bears. 2003-11-02.
- "untitled obituary 8". The Hartford Courant. 1966-08-04. p. 16.
- "Jackson Keefer, Ex-Brown Gridder". Newport Daily News. 1966-08-04.