Michael D. Leinbach was the last launch director in the space shuttle program at NASA's John F. Kennedy Space Center, responsible for overall shuttle launch countdown activities until the end of the program in 2011. In November 2004, Leinbach was awarded the prestigious 2004 Presidential Rank Award. He lives in Scottsmoor, Florida.

Jonathan H. Ward works to bring the thrill of the space program to life for the general public as a Solar System Ambassador for the Jet Propulsion Laboratory and as a frequent speaker on space exploration topics to interest groups and at regional conferences. He is the author of two previous books on space exploration. He lives in Greensboro, North Carolina.

Captain Robert L. Crippen, USN, Retired (foreword) was Columbia’s first pilot. He received a bachelor of science degree in aerospace engineering from the University of Texas in 1960. He has received numerous special honors, including the NASA Outstanding Leadership Medal, three Distinguished Service Medals, the US Navy Distinguished Flying Cross, the Defense Meritorious Service Medal, the FAA’s Award for Distinguished Service, the Goddard Memorial Trophy, the Harmon Trophy, four NASA Space Flight Medals, the NASA Distinguished Service Medal, the Department of Defense Distinguished Service Award, the American Aeronautical Society Flight Achievement Award, the National Geographic Society’s Gardiner Greene Hubbard Medal, the Aviation Hall of Fame 1981 Al J. Engel Award, American Legion’s Distinguished Service Medal, the Society of Experimental Test Pilots Ivan C. Kincheloe Award, and the NASA Exceptional Service Medal. He lives in Orlando, Florida.

Colonel Eileen Collins, USAF, Retired (epilogue) became NASA’s first female shuttle commander on a 1999 mission in the Columbia. She holds a master’s degree in mathematics and economics from Syracuse University, a master’s degree in operations research from Stanford University, and a master’s degree in space systems management from Webster University. She is from Elmira, New York.