John Sullivan is an American football center for the Minnesota Vikings of the National Football League. He grew up in Old Greenwich, CT, attended Greenwich High School in Greenwich, CT and played college football for the University of Notre Dame. Sullivan was a 6th round selection of the Vikings in the 2008 NFL Draft. John Sullivan is the starting center for the Vikings in 2009 after Matt Birk left in free agency to join the Baltimore Ravens. Sullivan signed a 5-year, $25 million contract extension with the Vikings on December 17th, 2011.