Colin Sims, MSc, is the Advanced Treatment Planning Director at Accuray Incorporated. Colin is a medical physicist and has worked with Accuray systems for more than 15 years, specializing in Treatment Planning for both CyberKnife and Radixact/TomoTherapy systems. He has spearheaded the research and development of many of the advanced planning features including optimization, dose calculation algorithms, adaptive capabilities, and imaging functions with special emphasis on radiosurgery and SBRT.