Jack I. Gregory (born 1931), former general in the United States Air Force
Jack Kerouac | Jack Nicholson | Gregory Peck | Jack Nicklaus | Jack the Ripper | Jack London | Jack Kemp | Jack Kirby | Jack Lemmon | Jack Black | Jack Abramoff | Jack Dempsey | Jack Benny | Jack White | Wolfman Jack | Union Jack | Jack White (musician) | Jack and the Beanstalk | Gregory of Tours | Order of St. Gregory the Great | Gregory Bateson | Pope Gregory VII | Jack Johnson | Jack Charlton | Jack Palance | Jack Daniel's | Jack | Gregory of Nyssa | Jack Paar | Jack Layton |
Notable Australian players during this period include Warwick Armstrong, Charlie Macartney, Warren Bardsley, Jack Gregory, Ted McDonald, Arthur Mailey, Jack Ryder, Herbie Collins, Bert Oldfield, Clarrie Grimmett, Bill Woodfull, Bill Ponsford and the most famous Australian player of all time, Don Bradman, whose career began in the 1920s.
In 1921, England having lost six Test matches in succession to the Australians under Warwick Armstrong, Tennyson was recalled to the side for the second Test at Lord's, and though the game was again lost, he scored an undefeated 74 in the second innings against Jack Gregory and Ted McDonald at their fastest.
After only one further match, he was replaced by Ted Ballard, although Kirkman regained his place in January before losing out again to Jack Gregory.
He and Jack Gregory caused something approaching panic among the England batsmen: John Evans' knees were allegedly knocking together when he went out to bat, and Andy Ducat was bowled when part of his bat, broken by McDonald's pace, hit the wicket.