Louis Brandeis started off by embracing the Theodore Roosevelt notion that hyphenated Americanism was unpatriotic. You couldn't have dual loyalties. But then he thinks and he reads and he becomes the head of the American Zionist movement after having previously been a secular Jew in this amazing intellectual evolution.

It's unfortunate that [Louis] Brandeis was not able to translate or abstract his devotion to cultural pluralism and racial equality as he put it for Jews to enslave people and their descendants and to African Americans.

That strain of anti-monopoly crusading egalitarianism really runs throughout American history from [Tomas] Jefferson to Woodrow Wilson, that finds its apotheosis in [Louis] Brandeis, continues through the New Deal, but then it sort of peters out in the '60s because progressives in particular become more interested in extending equality to minorities, and women, and other excluded groups, and little more suspicious of these old white guys, often from the south, who were crusaders against monopolies.

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.

I'd say that [Louis] Brandeis practiced a kind of a "living originalism," to use the title of Jack Balkin's great book. He said you start with the paradigm case, which in the case of the Fourth Amendment was these general warrants or writs of assistance, but you define it at a level of abstraction that you can take it into our age and make it our own.

For [Louis] Brandeis, you know, ethnicity and background are much less important than facts and reason. And he believes that far from wanting to efface our diversity of perspectives, we have to embrace it because that makes us more American, not less. In that sense, he's incredibly modern in an age of cultural pluralism. And it is disappointing for just the reasons you say that not everyone has embraced his pluralistic vision.

Whenever I felt tempted to, I don’t know, watch cat videos or bad Netflix TV instead of writing this Brandeis biography, I thought of his stern but kindly visage and buckled down and wrote the damn thing, because there’s so much information out there, and these are such anxious times in democracy, such unreasonable times.