Peyser won two national championships while playing with the Johns Hopkins Blue Jays.
As a freshman, he played in all sixteen games and helped the Blue Jays win the 2005 NCAA Division I Men's Lacrosse Championship.
Peyser was named to the 2007 NCAA Division I Men's Lacrosse Championship All-tournament team for his efforts in the tournament.
[1] As a senior, Peyser and the Blue Jays were again in the national championship game; however, this time they were defeated by the Syracuse Orange.
[2][3] Peyser joined the New Jersey Pride which already featured his two older brothers, Michael and Gregory.