Forensics mostly. Beating up the bad guys-he lived in Gotham City and the thing was...well...is that a lot of the criminals he fought in Gotham were... Kind of silly.

All the same though, he was fighting for truth and justice. His parents were killed when he was a kid and he wanted to become a hero to avenge them. To declare a war on crime.

He used science and then he used his utility belt-lot like our base belts to get criminals. His thing though was that he never used a gun.

He always gave even the craziest guys a fair shake.