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Jonathan studied Economics at Lancaster and Cardiff. He has been a Visiting Fulbright Postdoctoral Research Scholar at the McIntyre School of Commerce, University of Virginia, USA;Ìýa Visiting Fellow at the University of Warwick, UK, a Visiting Fellow at the European University Institute, Florence and a Fellow of Financial Institutions Center, Wharton School, University of Pennsylvania. He has been a joint Editor in Chief of the Journal of the Operational Research Society (2010-2019). He was a Deputy Dean (2016-21) and Director of Research (2014-2019) in the Business School and the Director of the Credit Research Centre (1997-2021).Ìý He has recently held a Leverhulm Emeritus Fellowship (2021-2024).

Jonathan is an External Research Fellow of the Centre for Finance, Credit and Macroeconomics at the University of Nottingham,Ìý a Fellow of the Royal Society of Edinburgh and a Fellow of the Academy of Social Sciences.Ìý He is a member of the Editoiral Board of the European Journal of Operational ResearchÌý and of the Editorial Board of the Journal of Credit Risk.

I concentrate on two research areas.

1. Modelling of credit riskÌý This research is motivated by modelling and risk management problems that lenders and fintechs face with a view to developing innovations that enable risk to be managed more effectively.This work includes survival and multistate modelling, modelling of loss given default, of exposure at default and stress testing. I am particularly interested in using novel predictors, issues concerning variation over time, capital requirements issues, the inclusion of macroeconomic variables in scoring models and the use of very large datasets. I am interested in models for retail credit of all types as well as credit to SMEs and large corporates.
2. Overindebtedness and credit constraints This work concentrates on explaining who is overindebted and who is credit constrained using household and individual level data. This includes the effects of health changes and financial literacy on credit demand.
3. Effects of macroeconomic shocks on household finance

Some recent publications include:

• Djeundje, V. and Crook, J. (2025) A new method to predict Economic Capital for a lending portfolio. Journal of the Operational Research Society. (Forthcoming).
• Wang, Z., Crook, J. and Andreeva, G. (2025) Improving the accuracy of credit scoring models using innovative Bayesian prior specification method. Journal of the Operational Research Society, 76(2), 229-253.
• Goldmann, L., Calabrese, R. and Crook, J. (2024) A new ordinal mixed-data sampling model with an application to corporate credit rating levels. European Journal of Operational Research, 314(3), 1111-1126.
• Medina-Olivares, V., Calabrese, R., Lindgren, F. and Crook, J. (2023) Joint model of multivariate longitudinal outcomes and discrete survival data in INLA: an application to credit repayment behaviour. European Journal of Operational Research, 310(2), 860-873.
• Medina-Olivares, V., Calabrese, R., Crook, J and Lindgren, F. (2023) Joint models for longitudinal and discrete survival data in credit scoring. European Journal of Operational Research, 307(3), 1457-1473.Ìý
• Wang, Z., Crook, J. & Andreeva, G. (2020) Reducing estiation risk using a Bayesian posterior approach: application to stress testing mortgage portfolio loan default. European Journal of Operational Research, 272(8), 725-738.