Henry played at right half back on the Dublin senior football team.
He came on as a substitute and was later sent off in the O'Byrne Cup final for Dublin against Laois at O'Connor Park in Offaly.
David was on Dublin's 2008 O'Byrne Cup winning team, which defeated Longford in the final.
He also worked as a youth leader at Coláiste Árainn Mhóir in Donegal during his summer holidays during college, assisting in teaching Irish to teenagers.
[citation needed] David was part of the 2011 Dublin All Ireland winning squad who beat Kerry 1-12 to 1-11 in the 2011 All-Ireland Senior Football Championship Final.