Greenberg Traurig, which has been deliberate in its growth in Philadelphia since it opened its office there in 1997, has added a five-attorney environmental group from Ballard Spahr.

David Mandelbaum, who served as partner-in-charge of Ballard Spahr’s environmental practice, moved over to Greenberg Traurig last month with partner Monique M. Mooney, of counsel Marc Davies and associates Sabrina Mizrachi and Caleb J. Holmes. Mandelbaum, Mooney and Davies joined Greenberg Traurig as shareholders and Mizrachi and Holmes maintained their titles.