She is the author of Dutch Immigrant Women in the U.S., 1880-1920 (2002) and a coeditor of A Century of European Migrations (1991) and Letters Across Borders (2006). Her current research includes two projects: one relates marriage to international migration in the U.S. context, from "bride ships" to matchmaking websites, and the other examines the letters of a family of refugees from Austria during World War II.