Accelerators are a rapidly growing new form of organization that aim to stimulate entrepreneurship through intensive, limited-period educational programs, including mentoring and networking for the cohort of start-up participants selected for each program, to improve their ability to attract investment at the end of the program. Drawing on novel evidence from across the world, this is the first book to provide rigorous analysis of the nature and effectiveness of accelerators that will be invaluable for researchers, policymakers and entrepreneurs.