I am Hank Green, co-host of Vlogbrothers, Mental Floss, Crash Course, and SciShow. Professional YouTuber and guy who talks about science. AMA
My brother and I started making YouTube videos seven years ago. Now, we do it professionally on a number of different channels that we own or co-own. I also run VidCon, a conference for people who love and create online video, and co-founded a merch company for online creators, and a production company that converts classic novels into video blogs.
Proof: Aside from my seven-year history on Reddit...tweet
EDIT - Thanks for the Gold and Dogecoins!