John Dudley is a Professor in the Département d'Optique P. M. Duffieux at the Université de Franche-Comté and CNRS research institute FEMTO-ST in Besançon, France. His research has spanned both experimental and theoretical nonlinear optics and photonics. Roy Taylor is a Professor in the Physics Department at Imperial College London. He has made contributions in various aspects of laser research, photonics, ultrafast processes, optical fibers and nonlinear optics.