NASA's commercial crew development program : accomplishments and challenges : hearing before the Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, Wednesday, October 26, 2011

Recent developments in NASA's commercial crew acquisition strategy : hearing before the Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, second session, Friday, September 14, 2012

NASA human spaceflight past, present, and future : where do we go from here? : hearing before the Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, Thursday, September 22, 2011

Space exploration

Review of the proposed National Aeronautics and Space Administration human spaceflight plan : hearing before the Committee on Science and Technology, House of Representatives, One Hundred Eleventh Congress, second session, May 26, 2010

Commercial human space flight : joint hearing before the Subcommittee on Space and Aeronautics, Committee on Science, House of Representatives and the Subcommittee on Science, Technology, and Space, Committee on Commerce, Science, and Transportation, U.S. Senate, One Hundred Eighth Congress, first session, July 24, 2003

Next steps in human exploration to Mars and beyond : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Thirteenth Congress, first session, Tuesday, May 21, 2013

Pathways to exploration : a review of the future of human space exploration : hearing before the Committee on Science, Space, and Technology, House of Representatives, One Hundred Thirteenth Congress, second session, June 25, 2014

Sixty years of NASA leadership in human space exploration : past, present, and future : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Fifteenth Congress, second session, September 26, 2018

NASA's Exploration Initiative : status and issues : hearing before the Subcommittee on Space and Aeronautics, Committee on Science and Technology, House of Representatives, One Hundred Tenth Congress, second session, April 3, 2008