Siyong Kim is a Professor and the Director of the Clinical Physics Department in the Virginia Commonwealth University (VCU), USA. Since joining VCU in 2013, he has also served as the Director of the Medical Residency Program. He was educated at Seoul National University, Korea, and obtained a master’s degree in nuclear engineering in 1986. He entered the University of Florida, Gainesville, USA to study medical physics in 1993 and earned his PhD in 1997. Dr. Kim has since performed research in the area of dose uncertainty estimation, patient motion management, and image guidance methods, resulting in over 60 peer-reviewed journal articles and about 150 conference abstracts. He has mentored students both nationally and internationally and served as either a member of Editorial Board or reviewer for 20 scientific journals. He has published 12 book chapters and one report book, and has been actively involved in multiple AAPM and IMPCB (International Medical Physic Certification Board) committees. John Wong is a Professor and the Director of the Division of Medical Physics in the Department of Radiation Oncology and Molecular Radiation Sciences at Johns Hopkins University School of Medicine, USA. Dr. Wong oversees the physics and dosimetry services of the department and his current research focuses on molecular optical imaging for pre-clinical radiation research, robotic ultrasound imaging for IGRT and informatics infra-structure for data sharing in radiation oncology. He is committed to advancing cancer treatment through education, research, and collaboration. Dr. Wong is the primary or contributing author of over 170 peer-reviewed scientific publications and 20 book chapters. He has been a principal investigator or co-investigator on 20 research initiatives funded by public agencies and industries. He is a co-inventor of the Active Breathing Coordinator, flat panel Cone-Beam CT and the Small Animal Radiation Research Platform (SARRP) that have been commercialized as radiation therapy products for the clinical and research community. Dr. Wong is a Fellow of the American Association of Medical Physicists, the recipient of the George Edelstyn Medal from the Royal College of Radiology, United Kingdom in 2001, and the awardee of the Edith Quimby Lifetime Achievement Award of the AAPM in 2017.