Founded in 1999, the BrainPop websites display animated, curriculum-based content that supports educators and are intended to be fun and motivational for students to watch. The sites' movies cover the subjects of science, social studies, English, mathematics, engineering & technology, health, and arts and music. Since 2007, the movies have been closed captioned. The sites also access a wide variety of educational games. BrainPop is used in more than 25% of U.S. schools and in many schools outside the U.S., as well as by parents, homeschoolers and others. The company was founded by Avraham Kadar, M.D., an immunologist and pediatrician, to explain medical concepts to his young patients using animation. Kadar served as CEO from the company's founding until 2019, when Scott Kirkpatrick was named CEO. As of 2011, BrainPop hosted more than 11 million unique visits each month, from thousands of schools and individuals worldwide. BrainPop uses an in-house team of educators, animators and writers to produce and continually update the sites, incorporating teacher and parent input.