Computer Pioneers by J.A.N. Lee. An article by Betty Toole is worth visiting. A second biography is available from St. Andrews University, Scotland. Iowa State University has recently opened a WWW archive on Atanasoff.
Access seems to be a little slow.
Here is another photograph of Atanasoff . And finally a biography of John Vincent Atanasoff by Hien Chris Do. Constructed by John Walker, it contains many interesting links that an enthusiast will want to follow. A Bibliography of sources related to the biographies of Computer pioneers has been extracted from the recently published book of Biographies of Computer Pioneers . Dan Bricklin was the developer of Visicalc, the first spreadsheet.