The Commonwealth Club of California website.

The Commonwealth Club of California is a non-profit, non-partisan educational organization based in Northern California. Founded in 1903, it is the oldest and largest public affairs forum in the United States. 

The Commonwealth Club has over 25,000 members and organizes nearly 500 programs each year on topics ranging across politics, culture, society, and the economy. Around 80,000 people attend these events in person annually. It is currently headed by an expert on international security and arms negotiations, former Pentagon official and businesswoman, Gloria Duffy. Club events are broadcast on many public and commercial radio stations in the longest-lasting continuous radio program in the nation. Recordings of these programs are deposited at Stanford University's Hoover Institution Archives.