Cozen O'Connor is expanding into western Pennsylvania, opening an office in Pittsburgh with three partners from Buchanan Ingersoll & Rooney.

Partners Thomas Giotto, Jeremy Garvey and Gene Giotto have joined the firm, Cozen O'Connor announced Wednesday, with additional lawyers expected to join them in the new Pittsburgh office in the near future.

In addition to the three Pittsburgh partners, Buchanan Ingersoll confirmed Wednesday afternoon that 14 other lawyers are leaving for Cozen O'Connor. They include four more lawyers in Pittsburgh, nine in Philadelphia and one in Wilmington, Delaware. Most are from Buchanan Ingersoll's labor and employment practice.