Paul H.C. Eilers is a Dutch biostatistician at Erasmus University Rotterdam (previously Leiden University Medical Center). He co-invented P-splines (penalized B-splines) with Brian D. Marx in a landmark 1996 Statistical Science paper, providing a computationally efficient and statistically principled approach to nonparametric regression that has since become standard in biostatistics and demographic methods. Currie, Durbán, and Eilers (2004) applied P-splines to the two-dimensional mortality surface, establishing their use in actuarial mortality forecasting.