Baillie is the founder and CEO of Spark Inside, a London-based charity that pioneers the use of coaching in prisons to reduce violence and reoffending. In 2016, the charity – which has coached more than 600 participants since it was formed – was shortlisted for the Charity Times Awards Best New Charity. Baillie is a TEDx speaker, co-curator of the Global Shapers London Hub and advisor to Code4000. She also founded the US non-profit Venturing Out, providing entrepreneurship education to people in prison. Baillie holds a BA from Harvard College and MPhil from the University of Cambridge.