SAN FRANCISCO — For the Kahns, law is a family business.

Michael Kahn, senior counsel with Crowell & Moring, is a seasoned corporate litigator with more than 40 trials under his belt. His brother sits on the state bench in San Francisco and presided recently over the high-profile gender-bias trial against venture-capital firm Kleiner Perkins Caufield & Byers.

Michael's son, Matthew Kahn, is a partner with Gibson, Dunn & Crutcher specializing in securities litigation. And Michael's nephew David Gamage teaches tax and other subjects at UC-Berkeley School of Law.