The Authors

James M. Grimwood has been NASA Manned Spacecraft Center Historian since 1962. He was born in Lincoln, Alabama (1922), taking his A.B. degree from Howard College, Birmingham, Alabama (1948), and his M.A. in History from the University of Alabama (1950). He taught history in secondary schools (1950-1952), and at San Antonio College in Texas (1958-1960). Grimwood was an Air Force Historian in South Carolina and Texas (1953-1960). Prior to joining MSC, he was historian with the Army Missile Command, Huntsville, Alabama, preparing histories of Army missile systems. He is a joint author of This New Ocean: A History of Project Mercury (1966), and author of Project Mercury: A Chronology (1963). He is married and has two children.

Barton C. Hacker has been a Research Associate in the Department of History at the University of Houston since 1966. Born in Chicago, Illinois (1935), he received his B.A. from the University of Chicago (1955). After serving in the U.S. Army he returned to the University of Chicago, receiving his M.A. in History (1962) and Ph.D. (1968). Before coming to Houston he taught the history of science at the University of Chicago (1965-1966). In addition to several papers presented at scholarly meetings, he is the author of "Greek Catapults and Catapult Technology: Science, Technology, and War in the Ancient World," Technology and Culture, IX (1968), 34-50. He is married and has one son.

Peter J. Vorzimmer has been Associate Professor of History at Temple University since 1967. Born in New York City in 1937, he received a B.A. in Zoology from the University of California, Santa Barbara (1958), and his Diploma in History and Philosophy of Science (1959) and Ph.D. in History of Science from the University of Cambridge (1963). He was Assistant Professor of History at the University of Washington (1963-1966), and Research Associate in the Department of History at the University of Houston (1966-1967). He is married and has two children.