the team

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Russell Mulliner
Managing Director

Russell established Marches Biogas in 2009 and has since led the company to build over 30 anaerobic digestion plants, most of which remain supported by Principle Biogas or Evolution Biogas along with a number of non-Marches Biogas facilities.  Previously Russell was a director of Greenfinch Ltd where he was fundamental in a number of research projects in collaboration with the University of Southampton which led the UK’s first ABP compliant anaerobic digester.  Russell was key to the design and operation of the plant and has since designed and built a number of plants dedicated to animal by products.  Russell has also worked with Water Authorities since 1996, helping them to maintain and increase the outputs from their anaerobic digestion assets. 

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Keith Knight
Divisional Director

Keith Knight joined the team in 2018 as the Divisional Director for Principle Biogas. Keith has been working within the AD Industry since the 1980’s. He has previously worked with the likes of Enpure Ltd and Biogen (Greenfinch) Ltd as Design Manager for each company. Within Principle Biogas, Keith has been overseeing the progress the company has made with their work within the waste water industry and developed the working relationships we have with the likes of Welsh Water.