Education
After playing high school soccer at the Noble and Greenough School in Dedham, Massachusetts, Tierney played college soccer at the University of Virginia, appearing in 79 games with the Cavaliers, starting 38, and scoring 11 goals and adding 16 assists in his four-year career. As a senior he scored a career-high seven goals, and assisted on seven more, helping his team to advance to the National Collegiate Athletic Association College Cup in 2006 for the first time since 1997. Tierney also played club soccer in the Boston Bolts youth program, under New England assistant coach Paul Mariner.
Career
College After playing high school soccer at the Noble and Greenough School in Dedham, Massachusetts, Tierney played college soccer at the University of Virginia, appearing in 79 games with the Cavaliers, starting 38, and scoring 11 goals and adding 16 assists in his four-year career. Professional Tierney was drafted in the first round (13th overall) in the 2008 Master of Library Science Supplemental Draft. He made his full professional debut for Revolution on July 1, 2008, registering two assists in a United States Open Cup third round game against Richmond Kickers.
He also played in the final of the 2008 SuperLiga, in which Revolution beat Houston Dynamo on penalty kicks after a 2-2 tie.
Tierney scored one of the shootout goals. Tierney became a regular starter for the Revolution during the 2010 season, starting in a variety of positions across the Revs" midfield and back line, including left back, center-back, right back, left midfielder, center defensive midfielder, center midfielder, and center attacking midfielder.
He scored his first professional goal on September 4, 2010 in a match against the Seattle Sounders. He scored the goal to tie it 1-1 in the 2014 Master of Library Science Cup Final.
Tierney is known for his accurate and fast crosses, whipped in from the left.