BrainPop is used in more than 25% of U.S. schools[4] and in many schools outside the U.S., as well as by parents, homeschoolers and others.[7] The company was founded by Avraham Kadar, M.D., an immunologist and pediatrician, to explain medical concepts to his young patients using animation.[6][9] Kadar served as CEO from the company's founding until 2019, when Scott Kirkpatrick was named CEO.[10] As of 2011, BrainPop hosted more than 11 million unique visits each month, from thousands of schools and individuals worldwide.[9] BrainPop uses an in-house team of educators, animators and writers to produce and continually update the sites, incorporating teacher and parent input.[8][9]