He went after Ivan Boesky.

He helped take down Mike Milken. Now Gary Lynch is going nose to nose with overbearing investment bankers. Last month CSFB named the former SEC enforcement chief vice chairman and gave him responsibility for stock research and legal and compliance issues. Lynch, who has been the firm’s general counsel since August 2001, has been spending much of his time defending charges by various state regulators and the NASD that the CSFB research group worked in lockstep with investment bankers during the bull market. Now that investment banks, including CSFB, have inked a historic $1.44 billion global research settlement, Lynch has been assigned to make sure that such excesses don’t happen again. He insists that he will be more than the cop on the research beat. “I don’t intend to write and edit research reports,” he says, “but I will be working on major strategy and planning issues as well as making sure that research analysts aren’t pressured on their reports.” The veteran securities lawyer concedes that he never expected this Wall Street role. Says Lynch, “There’s no way around it -- it’s different.”