J.T. O'Sullivan is a quarterback who plays for the San Diego Chargers of the National Football League. He was originally drafted in the sixth round of the 2002 NFL Draft by the New Orleans Saints.

He spent five seasons as either a third quarterback or on the inactive roster for the Saints, Green Bay Packers, Minnesota Vikings, New England Patriots and Carolina Panthers. He would get onto the field over the next three seasons, playing for the Detroit Lions, San Francisco 49ers, and Cincinnati Bengals.http://www.chargers.com/team/roster/jt-osullivan/c38a29b9-7259-4c2d-804d-5ac27034a0bd/

O'Sullivan returned to Cincinnati Bengals training camp in 2010 after playing sparingly as the backup during the 2009 season. O'Sullivan entered a battle in camp with Jordan Palmer for the Bengals' backup quarterback job. After a subpar training camp, O'Sullivan did not make the team and was released after the Bengals calimed Dan LeFevour off of waivers. O'Sullivan would then sign with the San Diego Chargers on September 6, 2010, to be the third quarterback for the team .http://www.news10.net/news/local/story.aspx?storyid=94289

After spending the 2008 season with the San Francisco 49ers, O'Sullivan signed with the Cincinnati Bengals on March 10, 2009. O'Sullivan was signed to be the backup to Carson Palmer. He would go on to appear in three games during the season. His stats were meager, as he completed just four of 11 passes for 40 yards. O'Sullivan also lost two fumbles during the three games in which he appeared.http://www.chargers.com/team/roster/jt-osullivan/c38a29b9-7259-4c2d-804d-5ac27034a0bd/ Cincinnati would bring him back for training camp in 2010.