A new wave of leaders: Early evaluation of the interdisciplinary Foundations of Leadership in Radiation Oncology (FLiRO) program

•170 interdisciplinary radiation oncology (RO) professionals from 36 countries have taken part in the Foundations of Leadership in RO (FLiRO) leadership program between 2018 and 2021.•95% of participants indicated that FLiRO learning would be very or extremely useful for application in their workplace environments.•Systematic leadership development for RO professionals is central to ensuring the global gap in radiation therapy access and utilization continues to be addressed.