"The Biographical Dictionary of American Economists" will contain over 600 entries by more than 100 authors. The Dictionary covers American and Canadian economists and writers/thinkers with views on economics from the pre-Revolutionary period to the 1950s. There are major entries on figures as diverse as Milton Friedman, Henry Carey, Kenneth Arrow, John R. Commons, Richard Ely, John Kenneth Galbraith, Frank Knight, Abba Lerner, Harold Hotelling, William Graham Sumner, and Edwin Seligman. Many articles are contributed by leading international scholars. The Dictionary contains all the major schools of American economic thought are represented, ranging from the Constitutional school to Keynesian and the Chicago School. A significant number of the subjects are female, including figures such as Anna Schwartz, Mabel Timlin, Mabel Newcomer, Margaret Gilpin Reid, Rose Friedman and Elizabeth Boody Schumpeter, highlighting the role that women have played in the development of American economic thought. More generally, the dictionary includes many minor but important figures who have contributed to that development, ranging from William Penn and Cotton Mather to Augustus M. Kelley and Leon Marshall. Individually, the entries capture important and often overlooked contributions to the development of economic thought in American; collectively, they encapsulate the rich diversity of that thought and the influences that have been at play on America economic thinking over four centuries.