The top federal prosecutor in Philadelphia is joining the firm of Conrad O'Brien Gellman & Rohn.

Patrick Meehan is to be a shareholder in the Philadelphia-based professional corporation starting Monday. He is to handle white-collar criminal defense, internal corporate investigations and corporate commercial litigation.

Meehan's decision to join Conrad O'Brien was announced Wednesday, the day after his last day as U.S. attorney for the Eastern District of Pennsylvania. He had served in that job since 2001 and was the district attorney of Delaware County before that.

There has been widespread speculation that Meehan will seek the Republican nomination for governor in 2010.