I am a political scientist at Johns Hopkins University. I study political parties, American political development, social movements, and political history.

I have written two books, both published by Princeton University Press. The Hollow Parties: The Many Pasts and Disordered Present of American Party Politics, written with Sam Rosenfeld at Colgate University, is forthcoming in May 2024.

My first book, When Movements Anchor Parties: Electoral Alignments in American History, was published in 2015. Here’s an interview reflecting on its themes.

I'm also working on a book about the relationship between financialization and center-left parties in the US and the UK since the 1970s.

I live in Baltimore, Maryland (buy seafood at Faidley’s) and Chilmark, Massachusetts (buy seafood at Larsen’s).