Career
Born in Saint Catharines, Ontario, Greenhalgh had a very successful junior career with the Saint Catharines Athletics of the OLA Junior A Lacrosse League. In 2000, he was awarded the "Joey Nieuwendyk Award" for Rookie of the Year. In 2002, with arguably one of the greatest junior teams ever assembled, Greenhalgh and future professionals Craig Conn, Billy Dee Smith, Matt Vinc, Athan Ianucci, Rory Glaves and Mike Hominuck, led the Athletics to an undefeated season and their second league championship in a row.
However, the A"s would lose the Minto Cup to the Burnaby Lakers.
He is second in career goals scored (136) and fourth in career points (169) at Cornell. NLL
Greenhalgh was drafted in the first round (3rd overall) of the 2005 NLL entry draft by the Philadelphia Wings.
He had an impressive rookie season:
Led the Wings in goals (31)
Tied with Dan Marohl for the lead in points (73)
Named Rookie of the Month for January
Given the 2006 National Lacrosse League Sportsmanship Award
MLL
Greenhalgh was selected by the Los Angeles Riptide in the second round (19th overall) in the 2008 MLL Supplemental Draft. He was also named to the Pre-Season Active roster of the Toronto Nationals for their inaugural season in 2009.
Greenhalgh participated in the 2007 World Indoor Lacrosse Championships, representing Scotland (Greenhalgh has dual citizenship through his mother).