I had read and heard that Edison was ruthless a a business man.
I know Tesla is much more appreciated today as a mathematician than he was in his time.

Reading up on Tesla. Interesting man with lots of accomplishments. Life is full of irony. Edison was his nemesis and he won an Edison award at one point.

from Wikipedia

Also in the late 1880s, Tesla and Thomas Edison became adversaries in part because of Edison's promotion of direct current (DC) for electric power distribution over the more efficient alternating current advocated by Tesla and Westinghouse. Until Tesla invented the induction motor, AC's advantages for long distance high voltage transmission were counterbalanced by the inability to operate motors on AC. As a result of the "War of Currents", Edison and Westinghouse went nearly bankrupt, so in 1897, Tesla released Westinghouse from contract, providing Westinghouse a break from Tesla's patent royalties. Also in 1897, Tesla researched radiation, which led to setting up the basic formulation of cosmic rays.[60]
Smart guy.