Gannon was an educator at the Nebraska School for the Deaf and served for many years in administrative roles at Gallaudet University.
[2] He met student Rosalyn Faye Lee at Gallaudet and they dated through their college years, getting married five days after graduating in 1959.
[2] His football team played an undefeated season in 1967 for the first time in the school's history and Gannon was named Omaha's WOWT Coach of the Year.
[6] In 1968 the family returned to the Washington, D.C. area and Gannon became the Executive Secretary of the Gallaudet College Alumni Association.
"[11] In 2011 Jack and Rosalyn Gannon received the International Solidarity Merit Award, First Class from the World Federation of the Deaf.
[12] Gannon was selected in 2014 as one of Gallaudet's "Visionary Leaders," fifteen prominent alumni honored to celebrate the university's 150th anniversary.