ReSI Housing Limited

David is an experienced leader in both executive and non-executive roles. He has over 30 years’ experience in Chief Executive roles, most recently at the National Housing Federation. He is Chair of Clarion Housing Association, is a previous President of Housing Europe and previous Chair of Reall, an international development housing charity. He is also chair of The Good Home Inquiry, co-chair of #Housing 2030, a joint project for Housing Europe and UNECE, and a member of the Archbishop of Canterbury’s Housing, Church and Community Commission. David frequently speaks on the challenge of optimistic leadership and the critical importance of governance. He has wide ranging media experience, is a well-regarded commentator and blogger and has extensive expertise navigating the world of politics and government. In June 2018 David was awarded a CBE.

Mark is the Executive Director of ReSI Housing and ReSI Homes.

He joined Gresham House in March 2020 following the acquisition of TradeRisks. Before joining ReSI Housing, Mark spent 12 years as a Chief Executive of Circle Housing Group, a 65,000-unit housing association, before merging it into the Clarion Group, the largest housing association in the UK. Prior to that, Mark held Chief Executive roles at Anglia Housing Group and Nene Housing Society.

He has 38 years’ social housing experience and has been a member of the Chartered Institute of Housing since 1986.

Sandeep joined Gresham House in December 2022 and leads the finance function for the Housing strategy, encompassing the full suite of financial reporting and analysis.

Sandeep has over 15 years of senior finance experience spanning financial control, valuations, product control and finance business partnering, to board and executive committee level, playing an active role in the delivery of strategic objectives.

During 10 years on the sell-side, Sandeep led and worked in teams which realised significant income opportunities and cost savings. In five years on the buy-side, Sandeep led a finance team implementing a finance operating model to facilitate the scale of a listed commercial real estate investment trust from IPO to a £1.2 bn market capitalisation.

Sandeep is a Fellow Member of Association of Chartered Certified Accountants.

Baerbel brings over 30 years of experience across architecture, construction, and development management, with deep expertise in residential delivery and environmental sustainability.
She serves as a Non-Executive Director at East End Homes, a London based housing association, and sits on its Finance & Investment Committee.

Baerbel previously held executive roles as Development & Board Director at Wates Residential and, before that, at Londonewcastle, where she spent 13 years shaping and delivering high-quality residential schemes. Across these roles, she led significant growth through challenging market cycles and built a reputation for navigating complexity with clarity and focus.

She brings deep expertise in joint ventures and partnerships, having served on and advised multiple boards. Her strength lies not just in structuring deals, but in aligning people, strategy, and delivery to make them succeed.

Originally trained as an architect, Baerbel’s career has evolved from design into construction, project leadership, and ultimately strategic development—giving her a rare, end-to-end perspective on the built environment.

She is also the founder of be.haus, a consultancy offering independent, strategic advice to developers and partners seeking clarity, confidence, and results.

Sandra has a strong background in social housing with over 30 years experience as a senior leader in the sector, most recently as Chief Executive of Octavia Housing. She has held Executive leadership roles within some of the countries largest housing associations and with local authority arms length management organisations (ALMOs), leading on housing and property management.

Sandra is an experienced non-executive having held roles in housing associations, the private sector and financial services.

She is currently a board member of MHS Homes, the largest independent social landlord in the UK, and is Chair of Heart of Medway Homes, a register subsidiary of MHS Homes. She is a Board member of Earnz PLC, an AIM listed energy services company supporting the journey to net zero and former non executive board associate at Principality Building society.

Graham brings a wealth of financial and governance experience to Resi Homes, with a particular focus on the social and affordable housing sector.

Graham joined the Board of Catalyst Housing in September 2017 and became a Board member and Chair of the Group Audit and Risk Committee at Peabody Trust when Catalyst merged with the Peabody Group in April 2022. Peabody is a substantial provider of residential property, development, and community management operations within the social housing sector.

From 2021 to 2025 he was Board Chair of St Arthur Homes Limited ,a for profit, registered provider (FPRP) acquiring, and managing, shared ownership housing, backed by private equity.
Graham has a professional background as a Chartered Accountant with substantial experience in working with companies focussed on growth across a range of sectors, including energy, technology, consumer, and financial services.