Banc One Investment chief quits

Paul Rubens, regional managing director at Banc One Investment Advisors, has quit to join a hedge fund, Blackhorse Asset Management. The Tokyo-based industry vet is now moving to Singapore to join Blackhorse's founders, John Engle and Jonathan Ross. He says his departure is not related to Chicago-based Banc One's announced merger with JPMorgan Chase. "We've been talking for over a year," Rubens says. "I've known John Engle for 15 years. The merged company [Banc One-JPMorgan] will be …