Trevor has lived in Hertfordshire for almost all his life and has encyclopaedic knowledge of the county and its wildlife. His parents moved to Cuffley in 1953 from where, even as a young boy, he was able to explore the countryside. Inspired by the 1959 London Bird Report and Frederick Warne's Observer?s book of ... series, he developed an interest in birds and butterflies. His first publications were hand produced Cuffley and Northaw Bird Reports (1961-1965). He trained and worked as a librarian until 1973 when he was appointed Keeper of Natural History in North. Herts Museums, working with Brian Sawford. Here he really had the chance to get to know the county and develop his botanical and entomological knowledge. After 17 years and moving the collection of 300,000 specimens five times he took the post of Head of Ecology at the newly formed Biological Records Centre at Herts County Council, leaving in 2001 to become Development Officer for National Recording Schemes with the National Biodiversity Network, based at the UK Biological Records Centre, Monks Wood, finally retiring in 2014.

Trevor has been Chairman of the Herts Branch of the British Naturalists' Association and Hertfordshire Natural History Society. He was editor of the Hertfordshire Bird Report from 1979-84. He was appointed Hertfordshire recorder for vascular plants in 1978, taking over from John Dony, and succeeded Bryan Sage as recorder for beetles in 1981. One of his main achievements is the county flora project from 1987-2005, culminating in his authoritative Flora of Hertfordshire, published by the Society in 2009.

He is currently working on a new ambitious volume Beetles of Hertfordshire. He says he could not have achieved any of this without the support of his wife Chris, whom he met at a HMWT working party at Oughtonhead NR in 1977. They live in Ashwell.