He has written or edited more than twenty books on aerospace history, among others including “Smithsonian Atlas of Space Exploration” (HarperCollins, 2009); “Robots in Space: Technology, Evolution, and Interplanetary Travel” (Johns Hopkins University Press, 2008); “Space Stations: Base Camps to the Stars” (Smithsonian Books, 2003; 2nd ed. 2009), which received the AIAA’s history manuscript prize; “Flight: A Celebration of 100 Years in Art and Literature” (Welcome Books, 2003); “Reconsidering a Century of Flight” (University of North Carolina Press, 2003); “To Reach the High Frontier: A History of U.S. Launch Vehicles” (University Press of Kentucky, 2002); “Imagining Space: Achievements, Possibilities, Projections, 1950-2050” (Chronicle Books, 2001); “Innovation and the Development of Flight” (Texas A&M University Press, 1999); “NASA & the Exploration of Space” (Stewart, Tabori, & Chang, 1998); “Frontiers of Space Exploration” (Greenwood Press, 1998, rev. ed. 2004); “Spaceflight and the Myth of Presidential Leadership” (University of Illinois Press, 1997); and “NASA: A History of the U.S. Civil Space Program” (Krieger Publishing Co., 1994, rev. ed. 2001).

He is also involved in other historical studies. His book, “Joseph Smith III: Pragmatic Prophet” (University of Illinois Press, 1988), won the prestigious Evans Award for biography. He has also published “Differing Visions: Dissenters in Mormon History” (University of Illinois Press, 1994), “Cultures in Conflict: A Documentary History of the Mormon War in Illinois” (Utah State University Press, 1995), “Kingdom on the Mississippi Revisited: Nauvoo in Mormon History” (University of Illinois Press, 1996), and several others. “Alexander William Doniphan: Portrait of a Missouri Moderate” (University of Missouri Press, 1997), discusses the role of the vital center in American politics during the Mexican-American War and sectional conflict.

More recently he has been studying the relationship of baseball to American culture and has published, “Charlie Finley: The Outrageous Story of Baseball’s Super Showman” (Walker and Co., 2010), and “Seasons in the Sun: The Story of Big League Baseball in Missouri” (University of Missouri Press, 2002).

He served as a consultant to the Columbia Accident Investigation Board in 2003 and presented the prestigious Harmon Memorial Lecture in Military History at the United States Air Force Academy in 2006. In addition, he is a Fellow of the American Association for the Advancement of Science, the International Academy of Astronautics, and the American Astronautical Society, and Associate Fellow of the American Institute for Aeronautics and Astronautics. He is frequently consulted by the electronic and print media for his views on space issues, and has been a guest commentator on National Public Radio and all the major television networks.