Simpson Thacher announced it is representing Hellman & Friedman in connection with its announced $1.1 billion acquisition of Renaissance Learning from affiliates of Permira, an European private equity fund.

The transaction is expected to close in the second quarter of 2014, subject to the waiting period under the HSR Act and customary closing conditions.

Wisconsin Rapids, WI-based Renaissance Learning is a provider of K12 assessment and learning analytics with a presence in more than a third of U.S. schools and 60 countries around the world.

The Simpson Thacher team includes Chad Skinner, Jonathan Amt, Brian Osimiri and Caroline Newton (M&A); Brian Steinhardt, Christian Fischer and Andrew Yong (Credit); Katharine Moir, Jason Vollbracht and Judy Yang (Tax); David Rubinsky, Tom Asmar and Nelli Zaltsman (Executive Compensation and Employee Benefits); Jeff Ostrow, Josh Walker, Michelle Morad and Linda Nyberg (IP); Michael Isby (Environmental); and Peter Thomas, Michael Naughton and Ellen Frye (Antitrust).