sentences:  He is co-editor with Paula Baker of "The Oxford handbook of American Political History," co-authored a textbook on American history with Paula Baker and W. J. Rorabaugh, and edited a five-volume history of the United States published in Warsaw, Poland.In 1987, he co-founded the quarterly interdisciplinary "Journal of Policy History".Published by Cambridge University Press, the Journal has published a number of prize winning essays and sponsors an interdisciplinary conference.