Brownlee posted his first YouTube videos while in high school, breaking down the inner workings of a HP Pavilion laptop he purchased with his saved allowance. Brownlee’s channel took off after he graduated from Stevens Institute of Technology, and he’s since made YouTube videos on smartphones, headphones, camcorders, smartwatches, tablets, speakers, Nike’s self-lacing boots and Tesla’s Cybertruck. More recently, he’s scored sitdown interviews with such luminaries such as Elon Musk, Bill Gates and Mark Zuckerberg.