Dr Freeman completed his PhD in Statistics at the University of Warwick, England before moving to Hong Kong to join the School of Public Health as a post-doctoral fellow in 2011. His current research area is on statistical inference from multivariate longitudinal data allowing for measurement error. His PhD research focused on learning with a new class of graphical model, the Chain Event Graph. With this new methodology he analysed the causes for varying levels of educational achievement in his department's undergraduate program.

Before he started his PhD, Guy worked at the Department of Public Health at the University of Birmingham, England, creating and applying Bayesian methods to the modelling of the health economics of various medical technologies, including left-ventricular assist devices and genitourinary tissue engineering, collaborating with medical and engineering professionals on a European Union-funded project.