Mario Bertolotti is retired professor of Physics and Optics with the Engineering Faculty of the Roma La Sapienza University, Italy. For decades he has been interested in lasers and their applications, carrying out studies on coherence, propagation of light in the atmosphere, scattering, holography, laser annealing, etc. More recently he has been interested in integrated optics, nonlinear optics, nano-optics, and plasmonics. He is author of more than five hundred papers in peer-reviewed scientific journals and  of several books, co-editor of a number of schools and conference proceedings, and editor or editorial board member of several journals. Concita Sibilia received her doctoral degree from the University of Roma “La Sapienza”. She is currently Head of the Nonlinear Optical Laboratory at the Dipartimento di Energetica of the University of Roma. She is full professor in Physics since 2000. Her main research interests are in the field of optics and nonlinear optics at nanoscales. She has chaired ESF-COST P11 action on “Physics of  Photonics Crystals“. She is author of more than three hundred papers in peer-reviewed journals. She is a member of the Optical Society of America, member of the European Physical Society, Board member of the European Optical Society and the Italian Optical Society. Angela Guzman is Professor Emerita from the National University of Colombia.  She obtained her Dr. Sc. degree from the Ludwig Maximilian University for research conducted at the Max Planck Institute for Quantum Optics, Germany, and conducted post-doctoral research at the Optical Sciences Center of the University of Arizona in Tucson, Arizona. She holds an Honorary Doctor degree from the Armenian State Pedagogical University after Khachatur Abobyan. She is author of more than a hundred papers in peer reviewed journals and co-editor of several conference proceedings. In 2007 she was made Fellow of the Optical Society (OSA) for her contributions to quantum and atom optics and for the promotion of optics in developing countries. Her main research areas have been quantum optics, nonlinear optics, and nonlinear effects in waveguides.