8. Nikola Tesla
The biggest rival of Thomas Edison, Nikola Tesla, was one of the greatest inventors ever lived. However, he wasn’t an excellent businessman; his inventions were made for the betterment of humanity, and he rarely ever wanted to make a profit off of them. Behind his creations, he had a charming disposition and a peaceful stare that would stop almost anyone in their tracks. His six-foot-tall stature definitely helped him to stick out of a crowd too, and he carried himself very stately with anyone and everyone in his company.