It's nothing like academia or a stereotypical think-tank. The environment is very aggressive, high-pressure, and results oriented. Nobody cares about your pedigree so long as your ideas work and make them money. Trading is one of the most purely competitive businesses in the world.
Most of the players are basically alpha male types who can do math and code. I actually think it's a great fit for people who are aggressive and entrepreneurial.
(And no, we're not front-running your orders or clubbing baby seals, despite the media's insistence otherwise.)