Professional summary

Research Interests

My main research area concerns the fate and behaviour of chemicals in the environment and in particular the application and development of mathematical models for helping to solve real world problems related to river water quality.  I have experience in modelling a wide range of potential contaminants of surface waters including nutrients, organic matter, micro-organic contaminants (including pesticides) and recently nano-particles. I have received ISO9001 internal auditor training.

My research has recently focused on predicting the concentrations in rivers of “down-the-drain” chemicals (e.g. personal care products and pharmaceuticals) and this extends to the study of steroid oestrogens. I use GIS tools to make maps of contamination and combine these concentrations with eco-toxicological effect levels to make risk maps. I model at a range of scales from small catchments up to the whole of the European continent.

Brief CV

2015 to 2019 Deputy Work package Leader  NanoFASE WP2 Model Development

2014 to 2019 Project Leader of the National Capability Project - Emerging Chemical Risks in Rivers

2013 to 2019 Project leader for NERC CEH input into a "Demonstration of Pollution Discharge Management for Water Quality Improvement in the Songhuajiang-Liaohe River Basin" funded by EU-CHINA Aid.

2013 to 2016 Group Leader Water Resources Assessment

2012 to 2014 Leading the CEH cross cutting national capability project on "Environmental Asessment and Risk"

2012 to 2013 Leading the CEH team using models to investigate the likely effects of climate change on water quality (algal blooms) in rivers and lakes (Defra funded).

2011  to 2013 Leading the CEH sub-contract to predcit concentrations of amines, nitramines and nitrosamines in drinking water in Norway that result from CO2 stripping of power station flue gases.

2010 to 2014 Part of the EU project NanoFATE. Responsible for modelling the fate of selected nanoparticles in the soil and water environment and for performing environmental risk assessments for these particles.

2010 to 2011 Part of a team making initial prediction of silver and colloidal silver in the rivers of England and Wales arising from discharges from sewage treatment plants (for Defra).

2009 to date In the EU framework 6 WATCH project advising on the development of water quality models for the global model outside Europe. Initially starting with point source loadings for India, Australia and the USA.

2009 to 2010 Leading project funded by Unilever to make predictions of triclosan concentrations in the river of England and Wales. This included estimating the ionic and neutral forms of the chemicals present at the prevailing pH levels in two major river basins (Trent and Thames).

2008 to date CEH project leader on Defra project to check drinking water abstractions for traces of pharmaceuticals. Specifically, to recommend sampling locations, take samples from one site and provide context data for results of the chemical analysis.

2008 to date Predicting concentrations of triclosan and D5 in rivers in England and Wales for Unilever.  Investigating current methods of estimating environmental concentrations, suggesting improvements and moving towards a risk assessment for triclosan

2008 to date Contributor to CEH project on titanium nano-particles. Responsible for predicting likely concentrations in UK surface waters.

2007 to date CEH leader of work package 3 developing global scale water quality models. Specifically responsible for estimating point pollution loads across pan-Europe for current situation and into the future (up to 2050). Includes developing the CEH GWAVA model to estimate water quality as well as water scarcity.

2007 to date Project leader for UK fluxes project. Developing tools to link NRFA data with water quality data to calculate and display chemical load data for catchments and groups of catchments.

2007 to 2009 Lead scientist for modelling steroid oestrogens in the River Ray and the wider Thames catchment as part of the EDCAT study in which these chemicals were removed from the effluent of Swindon STW.

2003 to 2008 Provided long term advice to the Environment Agency on risk assessments for steroid oestrogens, culminating in the final risk assessment for England and Wales in 2008

2007 to 2008 Coordinator for science theme 3.3 for the Water Programme – “models and tools for catchment management”

1999 to 2008 Member of the Editorial Board of Pest Management Science

2005 to 2007 Project leader on the impacts of NVZs on river  eutrophication – (sub-contracted from ADAS) included managing sub-contract to U of Plymouth for Estuary Modelling.


2004 to 2007 Member of the Natural Environment Research Council promotion panel III.

2003 to 2006 Part of a team working on Benchmarking Water Quality models for the Water Framework Directive – EU framework 5 project

2003 to 2006 Managing CEH contribution to a DEFRA funded project on the possible implications of climate change for pesticide registration (BGS lead).

2003 to 2005 Managing the CEH contribution to a scoping study of sheep dip disposal led by ADAS for the Environment Agency.

2002 to 2003 Leading a DEFRA funded project to model the fate and behaviour of pesticdes in Farm ditches using the TOXSWA model. Involved collaboration with Alterra, NL and Cemagref, France.

2001 to 2008 Carrying out risk assessments for endocrine distrupting chemicals discharged from   sewage treatment works for the Environment Agency at a national scale.

1998 to 2001 Manager of a MAFF funded project to investigate the attenuation of pesticides in streams and ditches

1997 to 2003 Leading a study of the temporal and spatial variations in dissolved oxygen in rivers. A first step in considering linking water quality and stream ecology.

1997 to 2001 Managing a study of the fate and behaviour of steroid oestrogens in rivers. Responsible for assessing likely distributions of these compounds using a combination of modelling and laboratory behaviour data.

1996 to 1999 Manager of a MAFF funded project investigating the biodegradation of pesticides in the saturated and unsaturated zones of the major UK aquifers.

1996 to 1999 Manager of a MAFF funded project to characterise the concentration of pesticides seen in headwater stream during rainfall events. Part of a larger project funded by EA/DOE/MAFF to study the effects of pesticide runoff on stream biota.

1995 Consultant to UN FAO developing research programmes on Non-Point Source Pollution as part of the Lake Victoria Environmental Management Programme.


BSc (Eng) Chemical Engineering, University of London 1980 

Panels, committees and memberships

British Hydrological Society

American Geophysical Union

Society of Chemical Industry