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We help clients achieve extraordinary sustainability returns


Gus Schellekens

Managing Partner - Europe, Middle East & Africa


Gus is passionate about delivering the sustainability agenda for people, cities and infrastructure. For the last 10 years, he has been working closely with international clients across MENA to address the integration of sustainability into long-term business strategy and growth plans.

A former Big Four consultant for 30+ years, previous roles have included leading both the PwC and then EY MENA Climate Change & Sustainability Services teams, prior to which he worked internationally as a management consultant and as a tax consultant.

Gus is a two time winner of the UAE Environment Agency’s MENA Sustainability Leader of the Year award.

We are a global, sustainability-first management advisory firm.

Our VIRIDI GLOBAL delivery teams comprise senior sustainability & climate change professionals – mainly with Big 4 advisory and strategy management consultancy experience.

We bring globally connected “as-one” insights and solutions to our clients.

We also look to combine our own expertise and experience, where needed, with a carefully curated ecosystem of strategic external partner organizations and alliances that can add deep proficiency in specialized scientific, technical and economic disciplines.

Leadership Team

David Greenall

Managing Partner - Americas & Caribbean


For 25 years David has helped organizations to embrace disruptive change, exercise sustainability leadership, and drive strategic transformation. He is passionate about social and climate innovation, and how to apply strategic thinking to solve complex problems.

David formerly led the Sustainability & Climate Change advisory practice at both PwC and Deloitte (Central Canada), and the Energy, Environment & Transportation policy and advisory practice for The Conference Board of Canada.

He founded and was the first Country Director (Canada) of the Carbon Disclosure Project (CDP) – an institutional investor-led initiative to focus companies on managing and disclosing their climate-related financial risk.


Shailesh Tyagi

Managing Partner - India & Asia-Pacific


Shailesh has 25 years of experience specialising in ESG Risks, Sustainability Impacts, Climate Risks and Energy & Emissions and as a strategic adviser in the energy and resources sector. His experience includes portfolio management, policy advice, commercial and financial analysis, risk management, strategic positioning and assisting clients with growth strategies.

Shailesh was formerly the Lead Partner – Sustainability Services for Deloitte (Australia) and the Managing Partner – Sustainability Advisory and Assurance for ERM (Australia).

He also has led GIST Advisory S.A. four capital impact valuations offerings in the Asia Pacific region, working closely with Pavan Sukhdev (Founder & CEO of GIST Advisory). 

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