Poskay scored 468 points during his high school career, a New Jersey state record that stood was broken by Canyon Birch, who graduated from Manasquan High School in 2019 with 558 points.
[6] While at the University of Virginia, he was recognized twice as an All-American and was part of the school's Division I NCAA Men's Lacrosse Championship teams in 2003, as well as the team that won the 2006 championship with a 17–0 season record that made them the 12th undefeated champion in Division I history.
[6][7] Poskay took over the Head Coaching position at Montclair State University in fall 2018.
[6] Poskay was selected in the second round by the Boston Cannons, the 12th pick overall, in the 2006 Major League Lacrosse Collegiate Draft.
Poskay was recognized as winner of the Major League Lacrosse MVP Award and the Major League Lacrosse Offensive Player of the Year Award in 2010, a season in which he scored a team-record 45 goals.