Tarr grew up in Indianapolis before studying and playing rugby at The Southport School. He was selected to the USA Rugby Selects' roster for the 2014 Americas Rugby Championship developmental tournament. Tarr made his full international test debut for the Eagles in Romania in the fall of 2014. He signed a professional contract with PRO Rugby's title-winning Denver Stampede franchise prior to the inaugural season.
|11 Feb, 6:00 pm||Dell Diamond||Brazil||Men's Eagles||ARC||51 - 3|
|18 Feb, 8:00 pm||Swangard Stadium||Canada||Men's Eagles||ARC||51 - 34|
|25 Feb, 1:40 pm||Estadio San Carlos de Apoquindo||Chile||Men's Eagles||ARC||57 - 9|
|04 Mar, 3:10 pm||Cricket and Rugby Club||Argentina XV||Men's Eagles||ARC||27 - 27|