[1] Eiselen was born and grew up in South Africa where he played rugby and competed in Olympic weightlifting.
[2] Eiselen came to the United States and played football at Choate Rosemary Hall in Wallingford, Connecticut and helped lead the Wild Boars to an undefeated season and a New England NEPSAC 'A' Championship.
[2] Eiselen graduated from Yale University in 2020 with degrees in economics and political science.
[2] Eiselen started 34 games as a 4 year starter for the Yale Bulldogs.
[2] In 2017, Eiselen was selected as a HERO Sports Sophomore All-American and an All-Ivy League honorable mention after helping lead the Yale Bulldogs to an outright Ivy League Championship.
[4] He was also inducted into National Football Foundation's Hampshire Honor Society.