The sadistic villain’s real name is Lazlo Valentin, who was a skilled surgeon that suffered a psychotic break and developed an alternate personality called, you guessed it, Professor Pyg.
He forms the Circus of Strange and travels around the country to conduct twisted experiments to make others “better.”
You’d be forgiven for not immediately knowing who Professor Pyg is, as he’s a relatively obscure B-List Batman villain who has seen some rising clout over the last few years due to appearances in animated Batman TV shows and video games.