About us Social Enterprise UK Honorary Fellowship Mark Sesnan Mark Sesnan 2017 Cohort Mark Sesnan is the MD of the UK’s leading leisure charitable social enterprise GLL, founded in 1993 as a ‘spin out’ – and which now runs 258 leisure centres & gyms, 113 libraries and 10 children’s centres across the UK. GLL is a unique organisation that is simultaneously a Workers Cooperative, IPS Bencom, Charity and Social Enterprise. Mark has extensive experience in leisure management having worked for many years at a senior level in local government and the leisure trust sector. He is Secretary of Sporta, Co-Chair of the London Social Enterprise Leaders Business Club and a Director of UK Active. Mark has enjoyed 40 years in the leisure industry – without a day off sick – and has worked at every level from Poolside to Managing Director. As part of his 60th birthday bucket list, Mark ran his first marathon.