David Khourshid is the creator of XState and the founder of Stately.ai — the state-machine-as-architecture school of UI development that has reshaped how serious React, Vue, and Angular teams think about state management. He is one of the most cited voices on finite-state-machine modeling in front-end work.
His CourseFlix listing carries State Management at Scale in React & Next.js. Material is paid and aimed at front-end developers ready to think about UI state as something to model formally rather than scatter through component hooks.