Mark Wheeler

Co-Chief Executive Officer & Director


Mark is a market-leading underwriter who co-founded Mosaic in 2021. He was the founder of top-quartile Lloyd’s Syndicate 4000 and Pembroke Managing Agency, purchased by Hamilton Insurance Group in 2018. He held the role of president, international markets and led client engagement at Liberty Mutual Group following its 2017 acquisition of Ironshore. Mark served as CEO of Ironshore International, overseeing the creation of agency services, high-profile consortia and the expansion of the group to 14 countries. He started his career at Lloyd’s with Sturge in 1987 before joining SVB in 1990 where he was appointed active underwriter of the group’s flagship Syndicate 1007 in 2000.