Rachel Skiffer is Head of School at Khan Lab School in the USA. She brings deep school leadership expertise to this role along with a commitment to equity and passion for student-centred education. KLS is a non-profit, independent, co-ed school for ages 5 - 18+ founded in 2014 by Salman “Sal” Khan, founder of Khan Academy and author of The One World Schoolhouse: Education Reimagined. KLS is a model for innovation in education: academic progress is decoupled from age with every student expected to demonstrate mastery before moving on. Learning time is variable, but the depth of mastery is constant. Learning is supported through weekly 1-1 advising, real-world application, and a culture that fosters student agency.