Professor of United States Government and Politics in the Centre for the Study of Democracy at the University of Westminster and a Faculty Fellow in the Centre for Congressional and Presidential Studies at the American University in Washington, DC and the Institute for the Study of the Americas in the University of London's School of Advanced Study. He is also a Fellow of the Royal Society for the Arts.
Author of over 35 peer-reviewed articles in leading journals and book chapters as well as the co-author or co-editor of several books on congressional-presidential relations, the United States Congress, and comparative legislative politics. His new, coedited book, America’s “War” on Terrorism: New Dimensions in United States Government and Foreign Policy will be published by Lexington in 2008.
Previous publications include Congress and the Presidency: Institutional Politics in a Separated System (Manchester University Press), co-authored with Michael Foley and After Full Employment (Hutchinson University Press), coauthored with John Keane. He is also the coeditor of Leadership in Context (Rowman & Littlefield), coedited with Erwin C. Hargrove; and The Republican Takeover of Congress (Palgrave), coedited with Dean McSweeney.
Professional responsibilities include being Associate Editor of Politics and Policy, member of the editorial boards of Presidential Studies Quarterly and The Journal of Legislative Studies, and an executive committee member of the International Political Science Association's Research Committee of Legislative
Specialists. He was also chair of the Political Studies Association's Committee for the Annual Richard Neustadt Prize for the best book on United States presidential politics and, previously, has been chair and vice-chair of the American Politics Group of the UK Political Studies Association.
He has been a visiting fellow at the Brookings Institution, the Congressional Research Service at the Library of Congress, the Centennial Center of the American Political Science Association, the University of Essex, Texas A&M University, and a visitor to numerous universities throughout the world. He has also received awards from the British Academy, the Nuffield Foundation, The Everett McKinley Dirksen Congressional Leadership Center, USIS, and the LBJ Foundation.