When Jonathan A. Marshall left Pennie & Edmonds for Weil, Gotshal & Manges in February 2002, the news rocked the intellectual property bar. One of the nation’s top patent litigators was leaving one of the oldest and most prominent IP boutiques to join a global mega-firm.

It seemed a harbinger of things to come, and Marshall himself declared at the time that the future of IP practice lay with the bigger — usually richer — general-practice firms and not with the boutiques.