Neil Wollman, a psychology professor at Indiana's Manchester College, wants the pension fund giant to take a more proactive approach to the investments it makes for its $4 billion socially responsible fund. "We want TIAA-CREF to do good with our money in the Social Choice Fund, in addition to doing no harm," says Wollman. To make his point - loudly - the professor staged a demonstration last month on the sidewalk outside Leibowitz's Greenwich Village apartment building. Before the picketing Wollman had sent a letter to building residents, alerting them that someone in their midst was supporting "companies using sweatshop labor for profit, an energy company involved with the brutal dictatorship in Burma [Myanmar] and a company producing deadly tobacco products that is also tied to organized crime and international cigarette smugglers." The letter urged neighbors to come out and learn who the mystery man was, but the protest drew only a dozen picketers. As for Leibowitz, he was vacationing in California. Says Pat Connor, TIAA-CREF spokesman, "We've had an ongoing dialogue with Wollman going back several years and regret that he and his colleagues have decided to personalize this issue."