Ph.D. Princeton University.  Full Professor.   Membre correspondent, Académie International d'Histoire des Sciences (París). Marie Curie senior Fellow at the Max Planck Institut for the History of Science (2013-2015). Advisory Editor,  Isis (2001-2005); Book Review Editor,  Historia Mathematica (2005-2010); Editorial Board,  Annals of Science (2003-) and  Historia Mathematica (2006-). Director of the series "Clàssics de la Ciència" (IEC-EUMO).  He has published on the history early modern mathematics and optics, and also on Spanish science and the Franco regime.