 He is Founding President of the Society for Economic Measurement, Founding Editor of the Cambridge University Press journal, Macroeconomic Dynamics and of the Emerald Group Publishing monograph series, "International Symposia in Economic Theory and Econometrics", and originator of the Divisia monetary aggregates and the "Barnett critique".In consumer demand and production modelling, he originated the Laurent series approach to specification design and the seminonparametric approach using the Müntz–Szász theorem.His publications on bifurcation analysis and nonlinear dynamics have shown that robustness of dynamical inferences is compromised, when policy simulations are run only at point estimates of parameters, since confidence regions about those estimates are often crossed by bifurcation boundaries.