Trevor was sometime member of the following:
Fellow of the Institute of Environmental Management and Assessment. Elected to represent Corporate members on Council of the predecessor body, the Institute of Environmental Assessment and served on the Technical Standards Committee of IEMA.
Fellow of Chartered Institution of Water & Environmental Management and member of the Rivers & Coastal Group.
Chartered Environmentalist and Scientist. Former Member of the Chartered Institute of Wastes Management.
Member of the International Association of Impact Assessment and the British Dam Society (Associate Member of the Institution of Civil Engineers).