Launched in 2018, this course introduces foundation principles of effective leadership as they apply to senior trainees and junior (and more senior?) practitioners in the radiation oncology professions. The course is directed at professionals interested in developing expertise in leading teams for clinical care, quality improvement, advocacy, research and in all situations where they might positively influence patient care and the future of our discipline. The course links to a specific radiation oncology competency knowledge and skill-set developed through Delphi consensus process. (dx.doi.org/10.1016/j.radonc.2017.04.009 ).