The National Library of France (BnF) has awarded the 2019 Pasteur Vallery-Radot Prize to Institut Pasteur scientists Guillaume Duménil and Rogerio Amino. The winners were invited by BnF President Laurence Engel to receive their awards on June 13, 2019, at a ceremony held in the BnF Richelieu Library and attended by Daniel Louvard, a member of the French Academy of Sciences, and Stewart Cole, President of the Institut Pasteur. Here is a brief presentation of the two 2019 winners.