Want to leave a hedge fund? You'll need to have a long rest. : Remember those nasty non-competes at hedge funds? Barclays’ latest big quant hire is a reminder of just how long they last. Over eight months after leaving Citadel, Daniel Nehren, a former managing director at the fund, has finally taken up a new role at Barclays. Nehren led equity execution at Citadel. He joined Barclays as a managing director and will head statistical modeling and development, as well as equities.