About us Team Our Staff Mark Gillham - Chief Executive Mark Gillham is SLT's new Chief Executive starting on 5 July 2022. Mark brings expertise from over 25 years' experience working in charities and mental health services in London. He has been in charity leadership roles for over 10 years, collaborating with other charities, the local Council, NHS services and local businesses. Mark is excited to be joining SLT and said: "SLT is a special charity offering unique services run by a fantastic team. I see my role as enabling everyone in SLT's community to thrive. I'm keen to meet everyone involved and work together to create a positive future for SLT.' Mark is passionate about empowering participant voice, inclusive services, community partnerships and the value of volunteering. Mark loves visiting London's art galleries, spending time in nature and salsa dancing.