Imperial College London

Dr John Holt

Faculty of Natural SciencesCentre for Environmental Policy

Visiting Researcher







Silwood ParkSilwood Park





John Holt gained a BSc. hons Zoology at the University of Durham in 1979 and a Ph.D. in Entomology at the University of Southampton in 1983. He was a Post-doctoral Fellow at Imperial College from 1984 to 1987 and since then has had a long career with the Natural Resources Institute (NRI), University of Greenwich, where he is Reader in Resource Modelling. He currently works part-time for NRI and part-time for the Centre of Environmental Policy at Imperial. 

John has broad-based research interests in applications of modelling in natural resource management with particular experience in:

  • Infectious diseases of plants, particularly plant virus diseases and their insect vectors
  • Insect pest population dynamics and pest forecasting
  • Risk analysis and bio-security for pests and invasive species

He is working on a number of projects mainly concerned with the development of methods of risk assessment and risk management in plant health, biosecurity, bio-terrorism, GMO release and fishery sustainability.



Holt J, Leach AW, 2019, Linguistic variables as fuzzy sets to model uncertainty in the combined efficacy of multiple phytosanitary measures in pest risk analysis, Ecological Modelling, Vol:406, ISSN:0304-3800, Pages:73-79

van der Gaag DJ, Holt J, Leach AW, et al., 2019, Model of the probability of pest transfer to a site suitable for establishment following their arrival on imported fruit, cut-flower or vegetable produce, Crop Protection, Vol:117, ISSN:0261-2194, Pages:135-146

Holt J, Leach AW, Johnson S, et al., 2017, Bayesian Networks to Compare Pest Control Interventions on Commodities Along Agricultural Production Chains., Risk Analysis, Vol:38, ISSN:0272-4332, Pages:297-310

Leach AW, Levontin P, Holt J, et al., 2014, Identification and prioritization of uncertainties for management of Eastern Atlantic bluefin tuna (Thunnus thynnus), Marine Policy, Vol:48, ISSN:0308-597X, Pages:84-92

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