After 30 years, Dori Hanswirth knew the relationship was over.

She had been through two mergers in her time at the firm, which was called Squadron, Ellenoff, Plesent & Sheinfeld when she joined fresh off a federal clerkship in 1987. By 2010 it had become Hogan Lovells, and she eventually started thinking there might be better places to grow her practice and develop new relationships.