Michel Grzebyk graduated as Ingénieur Civil de Mines (École des Mines de Nancy, France) in 1989 and completed a doctorate in Geostatistics from École des Mines de Paris, France in1993. He joined INRS in 1994 where he served as the primary statistician for the Pollutants metrology division at INRS. Then he moved to the Occupational epidemiology division at INRS in 2009 where he is involved in the design, monitoring, analyses and reporting of epidemiological studies in occupational health. His interests include statistical models and methods for using exposure metrics built on historical data. He is a co- author of the flexrsurv package in R and of the STATA command stns. Number of peer-reviewed publications: 28.