He also spent several seasons with Northampton Saints in England across two spells, having studied at the university in the town and later worked as a teacher there.
He was promoted to assistant coach under his former teammate Mark McCall, and served in this role during Ulster's 2005–06 Celtic League title-winning season.
During his second stint with Ulster Doak continued to be involved with the Irish set up on occasion, serving as head coach of Emerging Ireland during their successful 2015 Tbilisi Cup campaign.
[7] Following a successful stint in the role, Clarke became the head coach position on a permanent basis, signing a three-year deal with the region in April 2018,[8] but was terminated in November 2019 after a dire start to their 2019–20 season.
[9] In June 2020, Clarke was announced as the head coach of the Dallas Jackals, a new Major League Rugby expansion team.