Susanne F. Yelin, is at the Physics Department, University of Connecticut, Storrs, CT, USA Louis F. DiMauro is Professor of Physics and Hagenlocker Chair at the Ohio State University. He received his BA (1975) from Hunter College, CUNY and his Ph.D. from University of Connecticut in 1980 and was a postdoctoral fellow at SUNY at Stony Brook before arriving at AT&T Bell Laboratories in 1981. He joined the staff at Brookhaven National Laboratory in 1988 rising to the rank of senior scientist. In 2004 he joined the faculty at The Ohio State University. He was awarded 2004 BNL/BSA Science & Technology Prize, 2012 OSU Distinguish Scholar Award, the 2013 OSA Meggers Prize and the 2017 APS Schawlow Prize in Laser Science. He is a Fellow of the American Physical Society, the Optical Society of American and the American Association for the Advancement of Science. He is currently the Director of the Institute for Optical Science and co-Director of the NSF NeXUS facility and the OSU Chemical Physics graduate program. He has served on numerous national and international committees, government panels, served as the 2010 APS DAMOP chair, vice-chair of the NAS CAMOS committee and currently serves on the NAS Board of Physics and Astronomy. His research interest is in experimental ultra-fast and strong-field physics. In 1993, he and his collaborators introduced the widely accepted semi-classical model in strong-field physics. His current work is focused on the generation, measurement, and application of attosecond x-ray pulses, study of fundamental scaling of strong field physics and application of x-ray free electron lasers. Hélène Perrin, Université Paris 13, Institut Galilée, France