The former co-chief executive of the world’s biggest hedge fund and newly elected chairwoman of Finra, the US securities industry’s self-regulatory arm, is joining HSBC’s board as an independent director effective Wednesday, the bank said.Eileen K Murray, 62, was one of the highest-ranking female executives in the hedge fund industry when she stepped down earlier this year from Bridgewater Associates, the investment firm started by Ray Dalio that manages about US$160 billion. She had been with…