Since he joined the Royal Mint in September 2012, Clark has worked on a number of projects including commemorative pieces which were given to attendees of the 2014 NATO Summit in Wales and medals struck to commemorate the 2014 Ryder Cup which took place at Gleneagles Hotel, Scotland. He has also worked on commissions for Azerbaijan, Costa Rica, Lesotho and Tanzania. In 2014 a design by Clark was featured on the Britannia coin. Prior to joining the Mint, Clark worked in commercial packaging design.