“People’s practice areas are going up and down in terms of revenue. It’s similar to what free agent athletes face. Do you have leverage or not? A senior partner moving to a new firm is like a mini-merger. You have to consider all the variables: the other partners, the nature of the practice and its portability, the firm’s philosophy. It’s just like courting a merger with the same due diligence on both sides.”

How Senior Partners Switch Firms — Legal Post