[1] He attended Brown University, where he earned letters in football from 1895 to 1897,[2] and baseball, including on the 1896 national championship team.

[5] At the end of Duquesne's 1898 season, he ran 60 yards on a punt return for a score against the Western Pennsylvania All-Star football team.

[5] He was hesitant to play professionally, because he wished to focus on his newly founded insurance business, but eventually signed with the Beaneaters.

[11] In 1917, Gammons led a group of investors which purchased the Providence Grays baseball team of the International League.

[5] He was named the club's president, but resigned that post in 1918 when he was appointed to the advisory committee of the Bureau of Mines during World War I.