Mark has served as Executive Director of C40 since December 2013, during which time the organisation has grown from 63 to 96 of world's greatest cities. Mark is proud to head a fast-growing team of 150 staff in supporting bold, collaborative mayors to demonstrate that tackling climate change will deliver economically stronger and more equitable cities. Prior to joining C40 Mark was Director at pioneering engineering and design firm, Arup, and before that was a senior adviser to the Mayor of London, in which role the London Evening Standard described him as “the intellectual force behind Ken Livingstone’s drive to make London a leading light of the battle against global warming." He reports to C40 Chairperson and Mayor of Paris, Anne Hidalgo, and C40 Board President, Mayor Michael R. Bloomberg. He believes that work should be fun, but that there is always time for music, narrowboats, and places you can get to by bicycle.