Education
Kelly is from Queens, New York, where he attended Xavier High School.
Kelly is from Queens, New York, where he attended Xavier High School.
Kelly debuted for the United States. national team at the age of 21 on 25 May 2013, coming on as a substitute against Canada during the 2013 Pacific Nations Cup. Kelly made his first start for the United States. on 8 June 2013 against Ireland. During the 2013 Pacific Nations Cup, Kelly played in four matches, two as a starter and two as a subordinate
At Xavier he was also a standout running back in American football, earning the nickname "Famous Seamus".
A number of universities were interested in recruiting Kelly to play American football. Kelly graduated from Xavier High School in 2009.
Kelly played college rugby with the University of California under coach Jack Clark. Kelly played with Cal in the Collegiate Rugby Championship, and was named to the Cyclic Redundancy Check All-Tournament team in 2010 and 2013.
Kelly was named a Collegiate All-American four times.
Kelly has stated that his goal after college is to play rugby professionally overseas. In September 2014 Kelly earned a one month trial with Gloucester with the view to gaining a full-time contract. After failing to gain a contract with Gloucester, Kelly joined SFGG for the 2015 Pacific Rugby Premiership season.