Felix is an Adjunct Professor at the Water Institute at the University of North Carolina and an Associate Fellow at the Tellus Institute. He was a candidate for the Executive Director of the United Nations Environment Programme (UNEP. In 2019 he stood for the Liberal Democrats for parliament for the constituency of Mid-Derbyshire.
He was the co-director of the 2014 and 2018 Nexus Conference on Water, Food, Energy and Climate.
Felix was the Executive Director of Stakeholder Forum for a Sustainable Future from 1992-2012. He played a significant role in promoting multi-stakeholder dialogues at the United Nations and prosed to the UN General Assembly the introduction of stakeholder dialogue sessions at the United Nations Commission on Sustainable Development.
He has been active at the UN since 1990 attending and actively participating in the World Summits of Rio Earth Summit, Habitat II, Rio+5, Beijing+5, Copenhagen+5, World Summit on Sustainable Development and Rio+20. He has also been to all the UN Commissions for Sustainable Development and many UNEP Governing Councils.
In 2011 he chaired the United Nations DPI 64th NGO conference - 'Sustainable Societies Responsive Citizens'. From 1997-2001 he co-chaired the UN Commission on Sustainable Development NGO Steering Committee. He has coordinated some of the most innovative stakeholder dialogues at the intergovernmental level Bonn Water (2001), Bonn Energy (2004) and Bonn Nexus (2011).
His most recent book is Tomorrow's People and New Technology: Changing How We Live Our Lives (October 2021).
He has written or edited twenty-one books and the first one by New World Frontiers ‘The Plain Language Guide to Rio+20: Preparing for the New Development Agenda” this is a sister publication to the Routledge book “From Rio+20 to a New Development Agenda Building a Bridge to a Sustainable Future” both written with Jorge Laguna Celis, Elizabeth Thompson. His previous one to that was “Only One Earth: The Long Road via Rio to Sustainable Development” with Michael Strauss and Maurice Strong. He also co-authored Negotiating the Sustainable Development Goals: A transformational agenda for an insecure world with Ambassador David Donoghue and Jimena Leiva Roesch (2017) and Stakeholder Democracy: Represented Democracy ina Time of Fear.