NECRO TIME!!
Not many people know, but Brandon was an avid writer as a child too. He just went under the pen name J.R.R Tolkien.
While studying to become a scientist, Brandon managed to actually make one of his early magic systems that created insane amounts of energy work. We just call the “science” nuclear fusion.
Brandon has a valid reason for leaving his account on the 17th Shard; he once spent to long at the fanfic section and wrote Edgedancer. While he was very proud of his work, he knew that next time, he wouldn’t be able to resist finishing the rest of the Cosmere.
Brandon was once taken hostage by a group of thieves on a foggy night. He convinced them to let him go, but only on the condition that he wrote a book about them. And thus, Mistborn was written.