Elon Musk was born June 28, 1971 and has become a South African-born Canadian-American business magnate, engineer, inventor and investor. He is the CEO and CTO of SpaceX, CEO and product architect of Tesla Motors, and chairman of SolarCity. He is the founder of SpaceX and a co-founder of Zip2, PayPal, and Tesla Motors. In "The Military Miniaturization, he was mentioned by Sheldon when discussing Elon's theory that our reality could all be part of a video game played by aliens.
Elon makes a cameo at the end of Young Sheldon episode "A Patch, a Modem, and a Zantac" where it reveals he managed to successfully create a landing rocket through reading Sheldon's notebook.