5. Leonardo da Vinci
Leonardo da Vinci was a productive genius who excelled in multiple fields of science and literature. He had erratic spelling and practiced mirror writing with his left hand. While his writing is sometimes strange, his drawings were always detailed and well rendered. It has been speculated that he had ADHD reflected by the fact that he started numerous projects and followed through on just a few. It might not be possible to know for sure if Leonardo da Vinci had a disability, but his genius is undisputed.