John is founding director of energy management consultancy Native-Hue Ltd. After working at Building Design Partnership and Energy Conscious Design he founded Target Energy Services in 1985. He joined Power Efficiency Ltd as a director in 2007 and built up a class-leading energy and carbon management team that moved with Power Efficiency to Balfour Beatty in 2011. He has developed renewable heat projects and enabled Energy Performance Contracts for large scale energy improvements at hospital Trusts. He is principal author of Technical Memoranda TM22 Energy Assessment and Reporting Methodology and TM46 Energy Benchmarks as used for all 200,000 mandatory building Display Energy Certificates. He is President-Elect of the Chartered Institution of Building Services Engineers (CIBSE) and chair of the Energy Performance Contracting Group at the Energy Systems and Technology Association.