With Wilson Sonsini Goodrich & Rosati’s John Roos set to become ambassador to Japan, the scramble to find a new CEO at Silicon Valley’s most powerful law firm has begun.

Two primary candidates have emerged: corporate rainmaker Steven Bochner and the head of litigation, Douglas Clark, according to sources familiar with the situation. And as management mulls the decision, the tired yet inevitable question about who will step into Chairman Larry Sonsini’s shoes as the face and glue of the firm must be asked. Will the person chosen — and Sonsini is expected to have a big say — be seen as his anointed successor?