And he [Louis Brandeis] talks to his young acolyte, Horace Kallen, who wrote this beautiful book called Cultural Pluralism, and he comes to believe that by being better Jews, or better members of our ethnic group, we can be better Americans, because America is like an orchestra in which identity is defined by the diversity of perspectives that we bring to the table.

I think the answer has to do with the fact that [Louis D.] Brandeis was a consistent critic of bigness in business and in government.

William Howard Taft, who he embarrassed in these congressional hearings, attacks him as an emotionalist and a socialist and a cosmopolitan in terms that kind of have an anti-Semitic overtone. And even the pro-Brandeis press supported him in terms that really seem creepy today. There's this piece from Life magazine. It says, "Mr. Brandeis is a Jew. And until now there's never been a Jew on the Supreme Court. Perhaps it's time we have one."

Louis Brandeis never had the opportunity - or he never sought the opportunity I should say - to work closely with African American lawyers. He was also a Southern Democrat, you know, at a time when both parties were supportive of segregation.

[Louis] Brandeis improves the prose. He simplifies it and perfects the balance of the sentence so it becomes even more memorable and aphoristic.

Do you think Bernie Sanders, for example, is citing Theodore Roosevelt as the progenitor of his critique of the banks when actually Roosevelt wanted to keep the banks together and regulate them.

Louis Brandeis really inspired me to write this book [Louis D. Brandeis: American Prophet]. It was a crazy deadline. The editor said I'd miss the hundredth anniversary unless I pumped the thing out in six months, because I'd been delaying and dilly dallying for so long. So he both inspired me to get up early and write.