Marco Muia - BSc MSc MCIWM - Managing Director


Marco worked as a waste regulation officer prior to joining The Environment Agency as a Team Leader in April 1996. He left the Agency and formed Oaktree Environmental in July 1997. Marco is a WAMITAB accredited assessor for the COTCs in waste transfer and treatment and provides expert witness assistance in planning and permitting appeals and in court cases. He also holds the level 4 COTCs for Hazardous Waste Treatment and Transfer.

Jane Muia - BSc - Director


Jane has a BSc (Hons) is Pharmacology and 20+ years' experience in the pharmaceutical industry.  She is also a Director of  Oaktree Environmental Ltd and also acts as a freelance medical writer, trainer and clinical research associate.

Richard Sims - BSc MSc -Director 

Richard joined us in January 2005 and has been a Director since 2012. He manages our survey and CAD team, which produces high quality plans using GPS and drone data for applications as well as preparing planning and permit applications for all operations. 

Joanne Perry - Credit Controller

Jo joined us in August 2003, and after the directors, is the longest-serving member of Oaktree. She manages Oaktree's accounts department and provides technical administrative support services to the rest of the team.

Dr. David Young - BEng MSc - Senior Consultant


David  joined us in April 2009. He is our resident air quality specialist and advises clients on air emissions modelling, legislation and Environmental Impact Assessment.

Chris Parry - Senior Consultant   

Chris joined us in April 2011 after working as a surveyor for Cheshire County Council. He specialises in site surveys, CAD and planning and permitting, fire prevention plans for end of life vehicle and waste sites.

Tiffany Holden - Technical Administrator

Tiff joined us in March 2016 and provides technical support to staff and clients.

Chris Greenwood- BSc MSc CGeol FGS

Principal Consultant

Chris joined us in January 2017 and specialises in hydrogeology, flood risk, contaminated land and landfill work.

Thomas Benson - BSc AMIEnvSc -Senior Consultant

Tom joined us in January 2018 and specialises in noise assessment and management, contaminated land and waste planning.

Isaac Allen -BSc - Consultant

Isaac joined us in July 2019 specialising in preparation of planning and permit applications.

Senior Planning Consultant - we have a vacancy