Gershom ben Moses (1683-1700) was Moshe Chafetz's son. Moshe published Gershom's Yad Charuzim, adding an introduction with Gershom's biography.
Based on dates in that biography: Born on Tuesday, the 11th of Adar, 5443 (March 9, 1683). He died on the fourth shabbat of Tevet (Tevet 25, 5460; or January 16, 1700) from plague (smallpox?) at age 16. (All sources say he was 17, but they subtracted the years and didn't account for the dates.)
Moshe Chafetz quotes some of Gershom's interpretation in Melekhet Machashevet.
From Chapter III - Poets of the Seventeenth Century (p.370)
"The scope of Hebrew poetry has also enlarged. While we find... at the end of the century the brilliant young son of Moses b. Gerson, Gentile (Hefez) (1663-1711) Gerson, who died in 1700 at the age of seventeen, busying himself with giving poetic form to the 613 Commandments (Shir Le-Taryag Mizwot), the theme of the poets of this period bears a closer relation to life, and its tone is more worldly. Even Gerson Hefez shows in his Yad Haruzim (Venice 1700) which is a dictionary of rimes, a fine appreciation of poetry and poetic forms, and the octave he quotes from his father is elegant and finished... The bulk of the poetry of the seventeenth century is philosophical, didactic, and polemic rather than religious. True poetic feeling is beginning to manifest itself."
Some information repurposed from Encyclopedia Judaica
Any information about Gershom Chafetz or his book is greatly appreciated; in particular, existing translations.
Contact me at djbrook@sbcglobal.net.