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Central London Energy Management Group


Diana Davidson


Chair and Treasurer

Diana Davidson was elected Chair of CLEMG, the Central London Energy Management Group in 2015 and Treasurer in 2019.

Prior to Founding Vertemis, her own sustainable development practice in 2010, Diana served as a Director and Senior Executive with several FTSE 250 and NASDAQ listed IS, Utilities Services and Professional Services organisations where she specialised in the digital transformation of regulated services and built environments for more than a decade.

In 2010, after her team at Lendlease won two C40 ‘Global Exemplar’ awards for pioneering predictive and mixed reality design in masterplanning and developing two low carbon communities in London, Diana was inspired to become one of the first Chartered Environmentalists to specialise in cleantech.

She currently serves as an independent NED and management consultant, sits on several client’s Advisory Boards, is a Fellow of the Energy Institute, Energy Managers Association and the Royal Society of Arts, a Foreign Expert in Sustainable Development and a graduate of the Royal Agricultural University and Henley Business School.

Since Diana’s appointment, CLEMG’s membership has more than doubled and our events are now predominantly online.


Martin Fry



Martin is the Hon President of the Energy Services and Technology Association and a Royal Academy of Engineering Visiting Professor at City, University of London. He is the UK lead for the European and ISO energy management standards under development and chairs the BSI energy management standards committee.

Michael Rudd



Michael is a partner at Bird & Bird LLP's London office. He co-heads the firm’s international energy management team. He started his career in the natural resource sector in Australia advising stakeholders on the utilisation of resource efficient technologies, particularly for operations in remote locations. Since 2005 he has applied his knowledge of resource efficiency to energy consumers and the built environment, with a particular focus on energy management.

Alex Rathmell



Alex’s background is in electrical engineering and he has worked in energy efficiency for over ten years. In 2009 Alex was one of the first engineers in the UK to be accredited by EVO as a Measurement & Verification Professional (CMVP), and pioneered the introduction of the International Performance Measurement and Verification Protocol (IPMVP) into the UK ESCO industry. In early 2011 Alex founded EEVS Insight, the UK’s first dedicated M&V service provider. Today EEVS is part of APC Technology Group, and is a significant European centre of expertise in M&V and performance management, working with government, public sector and corporate clients to ensure energy savings are correctly evaluated and properly valued. Alex recently completed an MBA with Ashridge Executive Education at Hult International Business School.

Stephanie Robertson



Steph Robertson began her environmental career in the automotive industry at General Motors after graduating from one of the top universities in the world, the University of Toronto. Receiving her Post Graduate diploma in Environmental Management and Assessment she then worked at Plains Midstream in the oil and gas industry as well as Mars Canada, known for manufacturing pet food. At Mars she acted as the site Sustainability Lead and helped chair workshops that set up an air leak detection program. This initiative won the regional sustainability award for the site. Recognising that energy management was her passion, she obtained her Certified Energy Manager (CEM) designation in 2019.

In what she refers to as the best career move of her lifetime, Steph accepted a position with the City of London as the Energy and Sustainability Reporting Manager in January 2020. Working in what's referred to as the "square mile" she manages energy contracts and calculates energy use for historic and iconic sites including Guildhall, the Old Bailey, Barbican Arts Centre and Tower Bridge. Her current project involves upgrading the energy management software which will allow for more detailed data analysis to support the City's Net Zero Carbon initiative.