Fiston is a postdoctoral fellow in public health at the Faculty of Veterinary Medicine, Université de Montréal (UdeM). He completed his PhD in public health/epidemiology (UdeM) and also holds a medical degree (M.D.) (Université du Bandundu, R.D. Congo), an attestation of special aptitude in internal medicine (Université de Kinshasa, R.D. Congo), a master's degree in public health sciences/epidemiology and biostatistics (Université Libre de Bruxelles- ULB, Belgium) and a complementary master's degree in public health/health and development (inter-university training, ULB, Université Catholique de Louvain and Université de Liège, Belgium).

Within the lab, Fiston is interested in neglected parasitic zoonoses, in this case neurocysticercosis. Specifically, Fiston applies Bayesian Latent Class Models (BLCM) to estimate the adjusted validity for measurement error of diagnostic tests in the absence of a gold standard. Currently, Fiston is conducting a systematic review and meta-analysis on estimating the validity of neuroimaging in the diagnosis of neurocysticercosis and will apply hierarchical MBCLs.

In addition to neglected zoonoses, Fiston is interested in the application of Mendelian randomization, a causal inference technique that uses genetic variants as tools to infer causal associations, and has an interest in various epidemiological and diagnostic research themes.