Brian Galle is not looking to ban billionaires. In fact, the tax law expert and key architect behind California’s controversial wealth tax proposal described himself as an “enthusiastic capitalist.” “I think capitalism is a great system that probably has, you know, enriched the lives of billions of people,” he told Fortune from his office in Berkeley, where he teaches courses on tax and nonprofit law. “But I’m not sure that our system is a functioning capitalist system right now.