Who’s who

Who’s who


This is the small dedicated team who oversee the day to day running of the trust.

Richard Ross-Chairman

Richard is the son of Nat and Teresa Rosenbaum, who founded Rosetrees. He qualified as a chartered accountant having gained a degree in economics at LSE after which he joined Regentsmead, the family business and is now the chairman. Richard was voted Spear’s Philanthropist of the Year Award in November 2011.

Ann Berger-Chief Executive

Ann joined Rosetrees as Director of Development in 2017 and took on the role of Chief Executive in 2018. Before joining Rosetrees, Ann spent many years in the finance sector and more recently led a joint initiative for Macmillan and Citizens Advice to provide financial advice for cancer patients. Ann also runs a family trust funding medical research.

Dr. Vineeth Rajkumar-Head of Research

Vineeth joined Rosetrees in 2017. Prior to that he worked at UCL specialising in cancer biology and imaging. He is responsible for grant triage and supports the review process and the impact evaluation of Rosetrees-funded research.

Ingrida Tverijoniene-Operations Assistant

Ingrida joined Rosetrees in 2007. Ingrida trained as a nurse and is an integral part of the operations team at Rosetrees. She is responsible for organising all the peer reviews for new applications which is the foundation of our selection process and she arranges our personal meetings with researchers.

Richard Miller-Operations Manager

Richard joined Rosetrees in 2012. Richard has a background in computing and information management, designing data systems and reporting. As the Operations Manager at Rosetrees he oversees grant and budget management at Rosetrees and provides analysis of all Rosetrees activities.

Sheree Oxenham-Senior Research and Development Officer

Sheree joined Rosetrees in 2016. Sheree started her career as a research scientist before moving into teaching including several years as a head teacher. She undertakes assessment of the impact of our completed projects and is responsible for the management of our annual interdisciplinary award.

Julian Chomet – Research Consultant

Julian joined Rosetrees in 2020. Since graduating from Warwick University with a research Masters (bacterial genetics), Julian Chomet has worked for over 30 years as a medical journalist and award-winning scriptwriter/director on broadcast and medical education programmes. He has also written books on cervical cancer, drug abuse and child development and provided website content for pharmaceutical companies.

Julian recently received an MA (distinction) in screenwriting from the University of the Arts, London.

Clive Winkler – Trustee

Clive qualified as an engineer in 1967. Clive has a long-standing connection with the founding family, both personally and commercially, which brings Rosetrees an external perspective from his wide variety of experiences..

Robert Mesnick-Trustee

Robert joined Regentsmead, the family business in 1987 and is now the financial director. Robert was appointed a trustee of Rosetrees in 2010 and leads the investment committee.

Sam Howard – Trustee

Sam is a qualified solicitor and was formerly the Rosetrees Trust CEO. He now heads up a development finance company. His experience in business and the charity sector means that he can continue to advise Rosetrees as a trustee.

Debbie Fox – Trustee

Debbie has had 20-year experience in the Not for Profit sector, spanning trustee and professional roles within a number of social care charities. She was Vice Chair of Jewish Care, trustee of the mental health charity, Jami and is currently Vice Chair of the Jewish Leadership Council & Chair of its division, Lead.

Debbie is the Executive Director of Behind Every Kick, a registered charity promoting social mobility and employment prospects for young Londoners.
She trained and qualified as a solicitor at Herbert Smith Freehills, spending over a decade post qualification as a Senior Lecturer and later a Visiting Lecturer at the University of Law.

Hayley Katz-Trustee

Hayley is an intellectual property solicitor who has over twenty years experience working for both Warner Bros. Entertainment and J.K. Rowling at The Blair Partnership, as well as more recently putting together fundraising commercial partnerships for The Lumos Foundation charity.

Jonathan Zenios-Trustee

Jonathan is an executive coach with a practice focused on clients in financial services and in the third sector, and has over 25 years of experience in the financial services industry. He has a wealth of knowledge, expertise and experience in the broader charity sector and Jewish community, sitting on the boards and committees of various organisations, including the Rosetrees Trust. He is also chairman of Jewish care.