Andrew Warren


Andrew Warren has been Director of the Association for the Conservation of Energy since its foundation in 1981.  In addition to writing regular monthly columns for several trade publications, he has also contributed articles to many international newspapers such as the Financial Times, The Guardian and The Independent.He was a former Special Advisor to House of Commons Select Committee on the Environment and has given evidence to many House of Commons and House of Lords Select Committees in the UK and also to inquiries undertaken by the European Parliament. He has spoken at a several hearings called by the European Commission and has spoken in every Member State of the European Union (EU-15) at a variety of conferences on energy and environment issues.


Mary Helena

Office Manager

Mary Helena is Andrew Warren’s PA, and ACE’s Office Manager.

Mary graduated from the University of Kent (English and American Literature) in 1979. She worked at the Economists’ Bookshop at the LSE for nearly a decade and subsequently spent many years working in administrative roles in the voluntary sector, mainly in overseas development organisations working in the areas of health and education. More recently she has worked as Office Manager at the Women’s Environmental Network.



Parliamentary Team

Jenny Holland

Head of the Parliamentary Team

Jenny is Head of ACE’s Parliamentary Team. In over nine years in the role she has overseen a number of high profile campaigns that have led to major changes in the law on energy efficiency.

A Cambridge law graduate and qualified solicitor, Jenny has worked in the political arena for a decade and a half – first as Political Organiser to an MEP and, immediately prior to joining ACE, as Political Assistant to a Labour MP. While working in Parliament, Jenny was Chair of the TGWU Parliamentary Branch and led the union’s successful campaign for improved pay and conditions for MPs’ staff.

Away from ACE, Jenny does occasional work as a freelance Parliamentary Consultant, specialising in sustainable energy issues. She also has extensive experience of running election and community campaigns. An Essex County Councillor from 2001 till 2009, she retains strong links with the East of England, where she serves on two regional advisory bodies – Sustainability East, a sustainable development think-tank, and Sustainable Built Environment East, championing low carbon solutions in the built environment.


Tanya Kenny

Parliamentary Campaigner

Tanya joined ACE in December 2008 and currently works part-time with the Parliamentary team, where she has been mainly involved with the Sectoral Targets Bill. She completed an MA in Globalisation, Development & Transition at the University of Westminster in 2004, where her thesis focussed on the issue of climate change and the sovereignty of the nation state. Following this, Tanya worked at Friends of the Earth and then at Local Works where she was one of the campaigners for the Sustainable Communities Bill. Prior to this Tanya taught English for several years in Bangkok, Portugal and also back in London.


Chiara Vitali

Parliamentary Campaigner

Chiara joined ACE in November 2012 as a Parliamentary Campaigner, focusing primarily on the Energy Bill Revolution campaign. She had previously interned for  a number of campaigning organisations, including the Environmental Justice Foundation and  Friends of the Earth. She completed an MSc in Nature, Society and Environmental Policy at the University of Oxford in 2009, and previously studied Anthropology at University College London. She has maintained a keen interest in social research, which was her main career focus for several years, and has recently spent three months in Tanzania as a volunteer researching community-based forest management. Chiara also has a keen interest in nature, climbing and the outdoors and is a founding member of sustainable events company Autumn Shift.


Ron Bailey

Parliamentary Consultant

Ron Bailey acts as Political Campaign Consultant to the Association. He has a 30-year record of organising Parliamentary and community campaigns across a broad range of issues. He has been instrumental in getting a number of Acts of Parliament on to the statute book, such as the Home Energy Conservation Act, Warm Homes and Energy Conservation Act and the Road Traffic Reduction Act. He is also the parliamentary adviser to the Micropower Council, the All Party Warm Homes Group and is currently campaigning for the Sustainable Communities Bill and the Food Justice Bill. Prior to becoming a political campaigner, he was involved in direct action politics such as the initiation of the current squatting movement in 1968.


Chas Booth

Senior Press and Parliamentary Officer (Scotland)

Chas first joined ACE as its Parliamentary Officer in Scotland in October 2005, and was promoted to Senior Press and Parliamentary Officer in November 2008. He is responsible for ACE’s policy and media work in Scotland, working closely with the Scottish Government and Parliament. He has been a member of the Scottish Government’s Fuel Poverty Forum since 2005, and is a regular contributor to the energy policy debate in Scotland.

Previously Chas worked as Parliamentary Officer for Friends of the Earth Scotland, lobbying and researching on a wide range of issues from energy efficiency and planning to transport. Earlier employment includes spells in both the Scottish and European parliaments and teaching English in Bosnia and Bavaria. He is an active member of the Scottish Green Party, a keen touring cyclist and lives in Leith with his wife and young daughter.



ACE Research Team


Pedro Guertler

Head of Research

Pedro joined ACE in 2003. He was born in Teheran, grew up in London, Portugal and Germany, returning to London to study. He read for a degree in Environmental Policy with Economics at the London School of Economics and has an MSc in Environmental Technology from Imperial College London. In addition to carrying out research, he manages all aspects of the Team’s work including its strategy and direction, budget, recruitment and so on. He is a member of the Energy Efficiency Partnership for Homes’ Fuel Poverty Strategy Group and the Islington Climate Change Fund’s advisory panel.


Jack Carrington

Senior Researcher

Jack joined ACE as a research assistant following a two month internship. After graduating from Oxford University in 2005 with a BA in Physics he worked in the Actuarial profession, but at the start of 2009 decided to change career and became involved in the Sustainable Communities Act Campaign at Unlock Democracy. He has a keen interest in financial modeling developed from his work in the actuarial profession valuing pension schemes and hopes to apply this to the problem of reducing carbon emissions.

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Antonia Jansz


Antonia joined the Research Team in September 2012. Previous to starting at ACE, she was undertaking research at University College London on the microclimatic effects of green and cool roofs and implications for energy consumption and health; a continuation of the dissertation she undertook as part of the MSc in Environmental Design and Engineering at the College. Antonia has recently spent time volunteering for the Vietnam Green Building Council, and prior to that worked for the GBC of Australia where she was involved in the development of the method for assessing energy and carbon dioxide emissions used within the Green Star tools (the Australian version of BREEAM). She also has experience in environmental assessment methods and energy modelling in the UK, including as Senior Consultant at the BRE.


Sarah Royston


Sarah joined the Research Team in December 2012.  Prior to this, she studied Geography at the University of Cambridge and Sustainable Development at the University of Leeds, and then completed a PhD at the University of York.  The thesis is entitled “Careers of Action on Climate Change: The evolution of practices throughout the life-course”, and explores how and why people adopt sustainable lifestyles.  Sarah then worked on a project called “Reducing Energy Consumption through Community Knowledge Networks” at Keele University, helping to reduce fuel poverty and carbon emissions through community action in a deprived area.  She has also been a long-term volunteer for Friends of the Earth.