Paul M Sharkey, HDipEE, BSc(Eng), MA, PhD, FIET, MISVR, CEng, is professor of cybernetics, member of the Cybernetics Research Group and Director of the Visualization and Interactive Technologies Centre at the School of Systems Engineering, University of Reading, Reading, United Kingdom. Professor Sharkey's research interests lie in the fields of robotics, control systems, active vision and virtual reality, particularly in the overlapping areas within these fields relating to systems architecture and systems where delays are an inherent part of the closed loop. In 1996 he founded, and remains the Programme Chair for, the International Conference Series on Disability, Virtual Reality and Associated Technologies, a biennial conference that brings together psychologists, physical and occupational therapists, clinicians, engineers and computer scientists to further understanding in the multi-disciplinary area in the field of rehabilitation and disability. He was also a founding member and is a current member of the Board of Directors for the International Society for Virtual Rehabilitation. In 2010, he was elected a Fellow of the Institution of Engineering and Technology. Joav Merrick, MD, MMedSci, DMSc, born and educated in Denmark is professor of pediatrics, child health and human development, Division of Pediatrics, Hadassah Hebrew University Medical Center, Mt Scopus Campus, Jerusalem, Israel and Kentucky Children's Hospital, University of Kentucky, Lexington, Kentucky United States and professor of public health at the Center for Healthy Development, School of Public Health, Georgia State University, Atlanta, United States, the medical director of the Health Services, Division for Intellectual and Developmental Disabilities, Ministry of Social Affairs and Social Services, Jerusalem, the founder and director of the National Institute of Child Health and Human Development in Israel.