I am a Professor of History at Salisbury University where I teach U.S. history survey courses, upper-level courses in immigration, labor history, U.S. Gilded Age, social and cultural history, history of drinking, and a graduate seminar in 19th-century American radicalism. I am an editorial board member of the journal Anarchist Studies.

My research focuses on American and transatlantic anarchism, immigrant radicalism, radical movements and social space, German and French-speaking immigrants in the Americas.

I am currently writing a biography of Johann Most, German-born socialist and later anarchist who immigrated to the US in 1882. This book is contracted with the University of Illinois Press.

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I received my Ph.D. in History from the University of Leuven, Belgium in 2003.

I was born in Hasselt, Belgium, grew up in Cologne (Köln), Germany and Genk, Belgium. I immigrated to the United States in 1997, and now live in Maryland.