Meet Our Trustees

Geeta Sidhu-Robb
Geeta Sidhu-Robb Chair

Geeta Sidhu-Robb is an author, inspirational speaker, Coach, Board Specialist, Entrepreneur, CEO and Founder of Nosh Detox. Her frequent appearance on Radio and National TV has given her a strong media profile as an expert. Geeta gave up her career as a corporate lawyer to set up her own business, Nosh Detox in 2008.

Geeta describes herself as a leadership coach with a holistic understanding of how to support female executives achieve success and develop the physical and mental equilibrium required to create growth in their organisations. Geeta also coaches Boards and Executive Teams in how to build successful and effective relationships.

Geeta has taken home Entrepreneur and Business Women of the Year awards in 2010, 2011, 2014, 2017 and 2019. Her strong skills in business development and her entrepreneurial acumen have seen Nosh grow from a start-up to a multi-award winning wellness empire that now consists of a group of companies including Nosh Raw and Nosh Infusion.

Her motto “Change is inevitable, suffering is optional. Anything is possible. If you can see it, you can do it; if you can dream it, you can make it happen.”

Sarah Thomas
Sarah ThomasDeputy Chair
Sarah Thomas is an experienced marketing and communications strategist with a passion for innovation, creativity and technology. She is Group Chief Marketing Officer and Executive Vice President of Capgemini – a global leader in consulting, digital transformation, technology and engineering services,

Sarah has a scientific background and is a passionate advocate for STEM education for girls. She believes that Montessori values and education principles are critical for growing our next generation of innovators.

Prior to her current role, Sarah led the Culture & Employee Experience practice globally for award-winning brand consulting and design agency, Landor & Fitch, and enjoyed a 25-year career at Accenture where she was Chief Marketing Officer for the $12bn+, 120,000 people strong Accenture Operations business.

Sarah is also co-founder and CEO of Thomas Grey, a marketing & communications consultancy.

Sugata Mitra
Sugata MitraTrustee

JIn 2019, Sugata Mitra retired as Professor of Educational Technology at Newcastle University and is Emeritus Professor at NIIT University in Rajasthan, India.

He is best known for his Hole in the Wall experiment, where a computer was embedded in a wall in an Indian slum and children were allowed to freely use it. The experiment showed that children could learn to use computers without any formal training. Professor Mitra termed this Minimally Invasive Education.

Since 2006, his work at Newcastle University resulted in the development of Self-Organised Learning Environments for children. SOLEs, as they are called, showed that groups of children, presented with an interesting question, can learn almost anything by themselves. In 2010, he developed the Granny Cloud – where retired teachers provide the impetus to Self Organised Learning by children, anywhere in the world, over the internet.

In 2013, he was awarded the first $1 million TED prize to create seven Schools in the Cloud to study learning as emergent phenomena in an educational self-organising system. The results question the ideas of curriculum, examinations and the meaning of ‘knowing’ in a digital world.

Catja Thum
Catja Thum Trustee
Catja Thum is a Managing Partner at a Family Office, running an impact investment fund which invests in social enterprises and ventures, as well as sustainable companies in the UK and globally. Catja’s expertise lies in measuring and raising awareness of impact. She believes there is a misconception that Montessori values are only relevant to early years education, however, she advocates that they are crucial all the way through life.

Catja has 10 years’ experience in finance and helping start-ups to grow, as well as expertise in setting up and running her own charity, including fundraising efforts. In line with her role at 3C, Catja will be focused on the Social Impact projects, where Montessori’s values and collaborations will create positive social change..

As a social entrepreneur and impact investor Catja Thum champions female founders and founders of colour for meaningful social change.

Philippe Busslinger
Philippe BusslingerTrustee
Philippe is CEO at Wren House Infrastructure and is responsible for leading the infrastructure portfolio, team and investment strategy globally.

Prior to joining Wren House in January 2022, Philippe spent twelve years at OMERS Infrastructure, the last six as Head of Europe. He played a leadership role in investments such as HS1, Tank & Rast, Exolum, London City Airport, XpFibre, VTG and amedes.

Philippe has a background in investment banking and consulting. He was an Executive Director at Goldman Sachs, advising clients on M&A, equity and debt financing transactions across Europe. He started his career at McKinsey & Company.

Philippe holds a Business degree from ICADE (Universidad Pontificia Comillas, Spain), and an MBA from Columbia Business School (Columbia University, USA).

Carole Stone CBE
Carole Stone CBETrustee
Carole Stone CBE former producer of BBC Radio 4’s flagship discussion programme Any Questions?, former Managing Director of the online opinion polling company YouGovStone Limited and founder of The Carole Stone Foundation to support the belief that connecting people, exchanging ideas and building friendships around the world is essential to help make a fairer society.

Meet Our Executive Team

Leonor Diaz Alcantara
Leonor Diaz AlcantaraChief Executive Officer of The Montessori Group
Leonor Diaz Alcantara, is an award-winning social enterprise entrepreneur, whose career has spanned both the private and NGO sectors. She is Chief Executive of the Montessori Group.

Prior to this role, Leonor was CEO of the medical research institute, RAFT. Leonor spun out a commercial company called Smart Matrix Ltd, from RAFT raising $8m in social investment. This has been widely used as a case study in how to avoid risk in social investment.

Leonor has also had a number of Non-Executive roles and is often asked to speak at international conferences on leadership and entrepreneurship.

Leonor also mentors a number of young professionals at different levels of their careers.

Karen Chetwynd
Karen ChetwyndChief Operating Officer
Karen has worked extensively in educational quality assurance, partnering with FE and HE providers to secure programme recognitions, nationally and internationally.

Work with University partners; Ofqual Awarding Organisations and National Governing Bodies led Karen to support qualifications development from Entry to Post-Graduate, overseeing curriculum design within vocational Teacher Training; Performing Arts; Health and Fitness.

Karen’s work has supported access to greater physical education within schools; widened vocational and academic transferability for Performing Arts trainees and helped specialist HEI’s prepare for DAP’s.

Following her MA (Educational Leadership & Management) Karen became a QAA Reviewer, continuing to maintain an active research interest in authentic assessment practice in vocational training and development of educational partnerships and accreditations to benefit student progression.