By Dave Rogers2021-02-17T09:41:00+00:00 Mark Castle joined firm in 2004 Mace has said its chief operations officer for its construction arm is stepping down and will take up a non-executive director’s role at the firm this spring. Mark Castle joined the business from US fit-out specialist Structure Tone in 2004, having earlier spent seven years at Wates. Mark Castle will step down as COO this April He was recruited to set up the firm’s fixed-price contracting business, Mace Plus, and was later promoted to the Mace group board in 2013. When he joined, Mace’s contracting business was turning over around £100m a year but in 2008 the firm finally inked its breakthrough deal to build Renzo Piano’s Shard for Sellar – after surviving the threat of Laing O’Rourke nipping in at the eleventh hour to take the job and having Sir Robert McAlpine run the rule over its final numbers.