About us Our people Trustees Gareth Mostyn Gareth became a Trustee in July 2010 and was appointed Treasurer at the AGM in the same year. He chairs the Finance and Audit Committee. He is a Chartered Accountant with substantial experience in senior finance roles at major public companies. Currently Gareth is the Executive Head of Strategy and Corporate Affairs at De Beers Group, having previously been Chief Financial Officer from 2012 - 2016. "I am privileged to serve as a Trustee for SeeAbility. It's a wonderful organisation with great people doing great work to enable others to live their lives to the full."