One of the greats in a tradition-rich lacrosse program, Seibald became just the third Cornell men’s lacrosse player to earn All-American honors four times during his career with three consecutive first-team nods after a second team selection his freshman season. Cornell’s first-ever Tewaaraton Trophy winner, he was also the recipient of the USILA Lt. Raymond J. Enners Award, for the Outstanding DI Player of the Year, as well as the USILA Lt. Donald MacLaughlin Jr. Award, for the Outstanding Midfielder of the Year. Seibald was also selected as the Lowe's Senior Class Award winner for his achievements in the classroom, in the community and on the playing field, and was named the winner of the Diane Geppi-Aikens Scholarship, presented by CSTV in recognition of his outstanding commitment to community service. The award was presented to Seibald and a $5,000 donation was made in his name to the Dream Factory of Central New York.
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At the time of his graduation, Seibald was the only men's lacrosse player in the history of the Ivy League to be named a four-team first-team All-Ivy selection. He racked up 141 career points, the most ever by a Big Red midfielder, and proved to be one of the most consistent players in the country, having registered at least one point in 59 of his 62 career games. Seibald capped his senior season by ranking second on the team with 28 goals and third overall with 38 points. He also had 46 ground balls to his credit and won 19-of-40 face-offs (.475) on the year.
