Salman Khan

Founder of the Khan Academy, Salman Khan began by offering videos mostly about mathematics. The academy  expanded its faculty to offer courses about history, healthcare, medicine, finance, physics, chemistry, biology, astronomy, cosmology, American civics, art history, economics, music, computer programming and computer science. Supported by donations from the Gates Foundation, the Khan Academy offers video instruction free to anyone with internet access. teachers and students around the world us this tremendous resource.