Matt Rienzo is in his sixth season as an assistant coach with the Georgetown men's lacrosse program. Rienzo will continue in his primary role of working with the team's defense and running the substitution box.

Over the last four years, the Hoya defense has ranked among the top defensive units in the country. In 2003, Rienzo coached the unit to a Georgetown record for goals allowed per game at 7.33, which ranked seventh nationally. In 2004, the Hoyas gave up only 8.00 goals per game, and in 2005, the unit allowed only 8.27 goals per game in 2005 as the Blue and Gray advanced to the Elite Eight of the NCAA Tournament. The Hoyas ranked among the top-10 in the country in 2006 - ranking ninth by allowing only 7.54 goals per game - as the team won 12 games and the 2006 ECAC Championship.

He was the mentor to former long stick midfielder Brodie Merrill, a two-time First Team All-American and Tewaaraton Trophy finalist. Merrill was named the Outstanding Defensive Player after leading the Canadian National Team to the 2006 World Lacrosse Championship in July. In addition, Merrill played for the Portland (Ore.) LumberJax of the National Lacrosse League and was named its Defensive Player of the Year in 2006, the first rookie to ever win the award. In 2002, he coached Kyle Sweeney, the ECAC Defensive Player of the Year and a USILA First Team All-American. Sweeney started every game for Team USA at the 2006 World Lacrosse Championships.

Under Rienzo's tutelage, defensemen have received All-American honors nine times in five years, including Reyn Garnett, who was a second team selection in 2006.

Rienzo served on the staff at the University of Notre Dame in 2001. He worked with the Fighting Irish defense, which ranked third in the nation, giving up less than seven goals per game. The Irish advanced to the NCAA semifinals for the first time in school history.

Prior to his stint at Notre Dame, Rienzo was the Assistant Dean of Students and Head Lacrosse Coach at Gonzaga College High School. He guided his alma mater to a 14-7 record in 2000 as Gonzaga advanced to the Washington Catholic Athletic Conference Finals. In the fall of 2004, Rienzo was inducted into Gonzaga College High School's Athletic Hall of Fame.

Rienzo graduated from Georgetown in 1997 with a bachelor of arts degree in English. He played four seasons and was a three-year starter under Coach Dave Urick. A two-time team Most Valuable Player, Rienzo helped lead the Hoyas to their first-ever NCAA Tournament appearance in 1997, when he was named an Honorable Mention All-American. He played in the 1997 North-South All-Star Game after graduation.

Rienzo, the son of former Georgetown Athletic Director Frank Rienzo, is married to the former Julie Shaw and resides in Washington, D.C. They are the proud parents of a baby boy, Matthew Xavier, who was born on November 24, 2004.