The Sumner Group team comprises seasoned professionals with a firm stance on sound corporate governance.

Lord Chadlington - Chairman

Lord Chadlington’s career spans politics, public relations and journalism. A serial entrepreneur, he founded two of the largest global public relations networks: Shandwick and Huntsworth.

Lord Chadlington has advised various Prime Ministers – including Sir John Major and David Cameron. He was made a member of the House of Lords in 1996.

Most recently he founded his most recent strategic communications firm - The Chadlington Consultancy. He is Chairman and advisor to various international companies.

Lord Chadlington is Life President of the charity Action on Addiction.

David Sumner - Founder & Chief Executive Officer

David is a long term investor with over 20 years of experience in developing successful global business platforms focusing on the healthcare, security & defence, mining and leisure sectors. 


He has been instrumental in seeding, developing and managing the growth of many of the Sumner Group operating businesses and oversaw the public listings of both Sumner Group Mining and Sumner Group Health. He founded Sumner Group in 2018 to consolidate and build upon his business interests.


He has served on numerous private and public company boards in both an executive and non-executive capacity and has a track record of raising capital through debt and equity fundraising.


David founded The Sumner Foundation, a charity specifically set up to benefit disadvantaged students in the UK and also more recently refugees in the Middle East & North Africa.

Jonathan Sumner - Chief Financial Officer

Jon brings over 15 years of international experience in financial reporting, forecasting, audit, tax, and M&A project management. During his career to date Jon has held CFO positions with private and publicly listed companies in the UK, Europe, and Asia, where he has a track record of developing businesses and executing capital market transactions including public listings, privatizations, group restructuring and raising capital through debt and equity fundraising. 

Jon has been working for companies within the Sumner Group for 10 years and he remains a key member of the Company's Executive management team that is leading the development of the business.  Prior to this Jon received a BSc Honours degree in Mathematics from The University of Bristol before qualifying with and holding senior positions at PricewaterhouseCoopers and Deloitte. 

Jide J. Zeitlin, Non-Executive Director

Mr. Zeitlin spent the first 20 years of his career at The Goldman Sachs Group, Inc., where he held a number of senior management positions including serving as Global Chief Operating Officer of their investment banking businesses. He also served in the firm's Executive Office. Over the next decade, Mr. Zeitlin was a private investor overseeing the Keffi Group Ltd, an investment office that has life science and natural resource interests in the Middle East, the United States, and Africa.


Mr. Zeitlin is a member of a number of corporate and charitable boards, such as Affiliated Managers Group, Inc. (US$800 billion in assets under management) and the Nigeria Sovereign Investment Authority (where he is Chairman). He is Chairman Emeritus of Amherst College and formerly served on the boards of a range of institutions, including Teach for America, Harvard Business School, and the Doris Duke Charitable Foundation.


Mr. Zeitlin holds an A.B. degree in Economics and English from Amherst College and an M.B.A. degree from Harvard University.

Sir Michael Snyder, Non-Executive Director

Michael is currently Senior Independent Director of Metrobank PLC and was appointed Director of Sumner Group in 2020.


Previously he served as Managing and Senior Partner of what is now Moore Kingston Smith, a top 15 UK accountancy firm. During his tenure the firm grew its international association of firms to 64 Partners and 500 staff.


Michael also chaired the Association of Practising Accountants, a group of medium sized professional firms and acted for a wide range of sector agnostic clients.  


He has advised the government over many years, including chairing the National Business Angels Network and as a member of the Small Business Council and Small Business Investment Taskforce.  His advice to Government continued with professional services when he Co-chaired the Professional Services Competitiveness Review for the Chancellor of the Exchequer and was asked to be founder Co-Chairman of the Government’s Professional and Business Services Council. 


As an elected Member of the City of London Corporation, Michael has represented the Ward of Cordwainer since 1986. He was leader of the City Corporation as Policy and Resources Chairman between 2003 and 2008, He continues to chair the Capital Buildings Committee, currently responsible for the new City of London Police HQ and the new City of London Courts building on Fleet Street, which will include new Economic and Cyber Crime Courts and remains a member of the Policy and Resources and Finance Committees. 


He was knighted in 2008 for his services for business and for the City of London.


Michael is a long standing Governor and Chairman of Brentwood School, having previously been a Governor of The London Guildhall University and subsequently the London Metropolitan University.

General The Lord Richards of Herstmonceux GCB CBE DSO DL, Advisor to the Board

General Richards joined as an advisor to the board of Sumner Group in 2020.


Having commanded operations in East Timor, Sierra Leone, and Afghanistan, General Richards went on to command NATO forces in Afghanistan during the Alliance’s expansion of responsibility across the whole country.  He subsequently went on to command the British Army. 


In 2010 he became Chief of the Defence Staff, the professional head of Britain’s armed forces and their strategic commander as well as the Prime Minister’s military adviser and a member of the National Security Council.  He retired in July 2013.  


His UK operational awards include a Mention in Despatches, Commander of the British Empire, Distinguished Service Order and Knight Commander of the Bath; the first officer to receive an operational knighthood since World War 2.  In 2011 he received the annual Churchillian Award for leadership.  He was created Baron Richards of Herstmonceux in February 2014 and now sits in the House of Lords.  


Amongst other appointments he is a visiting Professor of Exeter University and an Honorary Fellow of both King’s College London and Cardiff University. He is Executive Chairman of Equilibrium Global the geo-strategic advisory company and actively involved with a number of charities, especially the Royal Commonwealth Ex-Services League of which he is the Grand President.  His autobiography Taking Command was published in October 2014.

Robert Hannigan, Advisor to the Board

Robert Hannigan joined as an advisor to the board of Sumner Group in 2020.

Robert was at the centre of UK national security for twenty years. He was the Prime Minister’s Security Adviser from 2007-10 and a member of the National Security Council and the Joint Intelligence Committee. Prior to that, he worked as principal adviser to Tony Blair on the Northern Ireland peace process. 


As Director of GCHQ, the UK’s largest intelligence and cyber agency, he established the new National Cyber Security Centre, bringing together government and private sector to improve the nation’s cyber security.


Robert is a leading authority on cyber security, cyber conflict and the application of technology in national security and contributes regularly to the Financial Times, BBC and other media. He chairs a UK Government-funded accelerator for cyber scale-ups and was a member of the Defence Innovation Advisory Panel. 


Robert is a Senior Fellow of Harvard’s Belfer Centre for Science and International Affairs, the Institution of Engineering & Technology and RUSI, and an Honorary Fellow of Wadham College, Oxford. He was awarded the US Intelligence Distinguished Public Service Medal in 2017 and honoured by Queen Elizabeth for services to UK national security in 2013.

Major General (retired) Nick Ashmore CB OBE, Advisor to The Board

Nick Ashmore joined as an advisor to the board of Sumner Group in 2020.

Nick joined the British Army in 1984.  Having spent his formative years at regimental duty, in both the UK and Germany, he went on to command 3rd Regiment Royal Horse Artillery from 2001 to 2004, a period which included a UN tour in Cyprus and the invasion of Iraq in 2003, for which he was appointed OBE.  He held four staff appointments in the Ministry of Defence and, as a Brigadier, was Director Plans in Army Headquarters. 


On promotion to Major General in 2011, Nick was the first Director Strategy and Plans in the then newly-formed Defence Infrastructure Organisation (DIO), responsible for Defence basing and infrastructure planning and programming, including the Defence Infrastructure Programme, the Defence Estate Strategy and the Army Basing Programme 


In 2015, he was appointed Military Secretary, leading the Army Personnel Centre in Glasgow, and responsible for career and talent management for the British Army.  He was the first Military Secretary to also hold the title of General Officer Scotland, as the senior serving Army officer in Scotland.  He was appointed CB in 2016.