[ by Melanie Gretchen ] The U.S. Attorney's Office for the Southern District of New York lost another officer to the private sector.  Top federal prosecutor Lisa Zornberg, 41, has announced she will leave her position for partnership at boutique white-collar defense firm Lankler Siffert & Wohl starting 9/10/12. Ms. Zornberg is a 14-year veteran at the SDNY, where she has served as co-chief of the complex frauds unit.  In this role, she has overseen more than a dozen criminal prosecutors on cases ranging from cyber crime to public corruption.  Last year, she won the Department of Justice's John Marshall Award, the department's highest honor, for a series of criminal and civil racketeering cases against the United Brotherhood of Carpenters and Joiners, a nationwide labor group. After graduation from Harvard Law School, Ms. Zornberg clerked for Sonia Sotomayor when the Supreme Court justice was on the federal bench in Manhattan.  In 1998, she worked the Manhattan U.S. Attorney's Office as a civil division attorney, before assuming the role of the division's deputy chief of appeals and then joining the criminal division in 2005. At Lankler Siffert, which was founded in the early 1980s, she will join the firm's 7 partners in defending other law firms, corporate clients, and handling complex civil litigation.  In the wake of her departure, Assistant U.S. Attorneys Richard Tarlowe and Michael Bosworth will lead the complex frauds unit together.   [Reuters, 9/9/12]