[1] On 20th June 2024 Dirksen grew up in the United States in Nashville, Tennessee, where he attended Lassiter High School (Marietta, GA), and played for the USA U17 and U18 national rugby union teams.
Dirksen made his debut for Ospreys in November 2009 against Bath Rugby and scored his first try for the region in February 2010 against Leeds Carnegie in his only other appearance in the 2009–10 season.
[5] Dirksen signed to play with NOLA Gold in March 2021 for the 2021 Major League Rugby season.
After one season in the United States, Dirksen returned to Wales ahead of the 2021–22 Indigo Group Premiership, once more playing for Swansea RFC.
His brother Cornelius made his debut for the USA in the 2012 International Rugby Series, and their uncle Corra Dirksen won 10 South Africa caps in the 1960s.