John Stewart is head of legal and company secretary at the Wellcome Trust, the UK's largest charity. He held the trust's hand when it became the first charity to access the capital markets through a £500m bond issue.

Among other tasks, Stewart secured a Section 26 order from the Charity Commission - the blessing that assured investors that the trust was in a position to pay back the bond.

When not busy putting together landmark bond issues, the rest of Stewart's time is spent managing his growing legal team. Below Stewart are three senior lawyers who have responsibility for different areas of the trust's work. This includes the UK Biobank project, a medical research study of the impact on health of lifestyle, environment and genes in 500,000 people currently aged between 40 and 69 from all around the UK.