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Cambridge Institute for Sustainability Leadership


Aris Vrettos

Aris leads CISL’s Centre for Business Transformation, which develops and integrates new thinking, tools and strategies that enable business to play a transformative role toward a sustainable economy. The Centre contributes to CISL’s research and thought leadership in sustainable business, purpose, culture, governance and innovation and also houses our Advisory Services, Business & Nature work and the CISL Accelerator and SME Hub.





Dr Gemma Cranston, Director, Business and Nature Team

Gemma 160x200Gemma is the Director of the Business and Nature team, collaborating with companies to identify strategic approaches to address their dependencies and impacts on nature. She is leading a team who are looking to amplify business support for ambitious global action on reversing nature loss, articulate a view on what business leadership looks like in the face of the ecological crisis and identify sustainable and scalable solutions.   




Eithne George, Director, Sustainability Hub and Accelerator

Eithne George

Eithne joined CISL in 2019, and is responsible for the strategic development and delivery of the Accelerator Programme for entrepreneurs and SMEs. 








Ben Kellard, Director of Business Strategy

Ben Kellard 1Ben leads CISL’s business strategy advisory work. He has a passion for shaping organisational purpose and strategies that unlock people’s desire to improve their own and others wellbeing, while sustaining the environmental systems the organisation relies upon. Doing so prepares organisations for the future.

He does this by helping organisations such as O2, Unilever and Burberry to develop and implement holistic leading strategies. Ben draws on over twenty years of experience as an organisational consultant, to involve a range of stakeholders to develop shared responses to complex and ambiguous sustainability challenges.


Alison Thompson, Director (Acting), Business and Nature Team

Alison ThompsonAlison has joined CISL as a Programme Director leading the Business & Nature team, whilst Gemma Cranston is on Maternity Leave. The team supports companies to understand their impacts and dependencies on nature, set evidence- based goals to address these, and align their strategies and decision-making processes to protect and restore nature, as part of CISL’s Centre for Business Transformation.




The team

James MacPherson
Programme Manager, Centre for Business Transformation
 Viola   Jardon
Programme Manager, Sustainability Hub and Accelerator team
Project Manager, Sustainability Hub and Accelerator team
 Jie   Zhou
Programme Manager, Sustainability Hub and Accelerator team
 Catherine   Weller
Programme Manager, Business and Nature Team
 Candice   Worsteling
Project Manager, Business and Nature Team
 John  Pharoah
Senior Project Manager, Business and Nature Team