Tarr grew up in Indianapolis, Indiana, before studying and playing rugby at the Southport School in Queensland, Australia.
[1] Tarr represented the United States under-20 team at the 2014 Junior World Rugby Trophy where he played in the front row alongside fellow future USA Eagle Titi Lamositele.
He made his test match debut on November 8 against Romania when he replaced Olive Kilifi at tight-head prop.
In February 2016, Tarr signed up to the new PRO Rugby North American competition with the Denver Stampede.
[4] In early 2018 he joined the New Orleans Gold of Major League Rugby.