David Holmes is a Chartered Scientist with experience in site investigation, conceptual site model development, remediation, and validation. He has a BSc and MSc from Aberystwyth University and a PhD from the University of Southampton. His graduate research examined multiphase flow in waste materials for landfill remediation. David has a particular interest in nonaqueous phase liquids (NAPL) and pioneered the use of light nonaqueous phase liquid (LNAPL) mobility as a metric in the United Kingdom, Ireland, and Europe.

In 2017, David was awarded the Brownfield Briefing Award for Best Scientific Advance, and in 2019 he won the United Kingdom Spill Innovation Award for his development of new LNAPL monitoring methods. David has spoken at several international conferences and is currently Chair of the UK Society of Brownfield Risk Assessors NAPL subgroup. He is a guest MSc lecturer at both the University of Portsmouth and the University of Greenwich.

David specialises in destructive treatment of per- and poly-fluoroalkyl substances (PFAS), having contributed to the emerging contaminants working group of the Network for Industrially Co-ordinated Sustainable Land Management in Europe. In his academic research, David continues to develop new technologies for PFAS treatment.