Mark Simms,
Chief Executive Officer,
P3 Charity and P3 Housing
Mark is proud to be the Chief Executive of P3 Charity and P3 Housing. Mark brings more than 35 years’ experience in the sector to his role as CEO, delivering innovative services in partnership with people who face some of the greatest life challenges. Under his leadership, P3 has expanded its services to reach more people in need, providing them shelter, support and resources to help them rebuild their lives.
Born in Nottinghamshire, Mark grew up in a family that was actively involved in community work and at an early stage, found that they needed the support of homelessness organisations. This early exposure to social issues motivated him to pursue a career in mental health nursing. After graduation, he worked in various roles within the charity sector, including fundraising, project management, and advocacy.
A passionate advocate for social justice and human rights, he is deeply committed to creating a more equitable and just society.
Mark has served for much of his career as a Non-Executive Director or Trustee of many independent charities, large and small. His current portfolio includes:
- Trustee of Homeless Link,
- Non-Executive Director of New Leaf, a social enterprise run for and by people who have been in prison,
- Non-Executive Director of The Big Issue Invest.
Gemma Bukel,
Deputy Chief Executive Officer,
P3 Charity
Gemma’s role as Deputy P3 CEO focuses on enabling P3 to enhance its current service provision and grow into new areas, increasing the charity’s reach and ability to support a greater number of people. She is experienced in ‘Social Impact Bond’ development, raising of social investment and project mobilisation.
In addition, Gemma has worked in the voluntary sector for over 21 years, focusing on business development, partnership working and fundraising. She is a fully certified member of the Institute of Fundraising and holds their Certificate in Fundraising Management.
Currently, Gemma sits on the board of Gainsborough Local Access Partnership, a partnership aiming to improve lives in Gainsborough by supporting and funding local social businesses and community organisations. She is also a Trustee of Homestart Newark.
Clare Chrisp,
Chief Financial Officer, P3 Charity
Deputy Chief Executive Officer, P3 Housing
Clare joined P3 in February 2020. Today she works as both the Charity's Chief Financial Officer and P3 Housing's Deputy CEO.
A graduate from Nottingham Trent University, she next joined the prestigious graduate training program at GEC. After qualifying as a chartered accountant, Clare moved to work for Boots and held a number of financial management roles, leading teams and driving change over a period of 20 years. She then worked briefly in higher education at the University of Nottingham, before joining Metropolitan Thames Valley Housing in 2014.
Clare also sits on the Audit Committee for Big Issue Invest and is a member of the Group Audit Committee for East Midlands Homes.
Rebecca Harrington-Leigh,
Chief Operating Officer,
P3 Charity
Rebecca has a degree in Psychology and 20 years of experience working in the voluntary sector. She has also worked in Primary Mental Health Care.
Rebecca has extensive experience of delivering homelessness, mental health and accommodation services and is the Safeguarding Lead for P3.
As P3's Chief Operating Officer, Rebecca’s role is to lead operations for the organisation, oversee People Shaping P3 and ensure our services remain aligned with our values, mission and ethos.
Hannah Kavanagh,
Executive Director of Housing,
P3 Housing
Hannah started her career in Housing in 2006 when she joined Home Group as a Project Worker in a supported accommodation service. She went on to spend 8 years at Orbit Group in a variety of roles, specialising in housing management and income collection, before going back to her roots in supported housing as a Service Manager for Salvation Army. Hannah joined P3 as an Operations Manager in 2019 and stepped up into the role of Head of Housing in 2022. She has an undergraduate degree in Social Policy and Sociology and a foundation degree in Housing, Communities and Regeneration.
In her current role she provides strategic direction and leadership to P3 Housing, overseeing the property and maintenance teams, working in collaboration with the Charity to deliver supported accommodation and secure future development opportunities.

Contact P3
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"No one can understand unless they've been there... P3 saved my life"
Person supported by P3 homelessness services