TIL that László József Bíró was a Hungarian inventor who patented the most commercially successful ballpoint pen also invented the automatic gearbox. He also at some point in his life, worked as a hypnotist, insurance salesman, book publisher and he also sold oil.

https://www.paperstone.co.uk/News/2016/exactly-mr-biro

https://www.reddit.com/r/todayilearned/comments/15270kj/til_that_lászló_józsef_bíró_was_a_hungarian/