Peyser was a two-time USILA All-American while playing for the Johns Hopkins Blue Jays. In 2002, he was awarded an Honorable Mention All-American distinction. While in 2003, his senior season, he was awarded Second Team All-American honors. He was the leader of the Blue Jay defensive unit as a senior, and helped his team reach the 2003 NCAA Division I Men's Lacrosse Championship game where they were defeated by University of Virginia.
