This book presents all of Leo Szilard’s scientific and technical papers published between 1925 and 1964, and a selection of his unpublished reports. The papers are topically organized: physics, including thermodynamics, X-ray effects in crystals, and nuclear physics (1925-1939); the Manhattan Project, including declassified papers and some correspondence (1940-1945); biology (1949-1964); and patent applications (1925-1964). The book also has a biography and photographs from different periods of Szilard's life. The introductions to the sections and the foreword were written by Szilard's scientific colleagues. Some of the papers are in German. Although the work does not include Szilard's memorabilia, his general and political works, or his fiction, it is useful to people seeking a detailed view of the brilliant and complex man's scientific life.