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

Exploring Mars and beyond : what's next for U.S. planetary science : hearing before the Subcommittee on Space and Aeronautics, Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, Tuesday, November 15, 2011

The National Aeronautics and Space Administration's fiscal year 2012 budget request : hearing before the Subcommittee on Space and Aeronautics, Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, March 2, 2011

A review of NASA's exploration program in transition : issues for Congress and industry : hearing before the Subcommittee on Space and Aeronautics, Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, March 30, 2011

Office of Commercial Space Transportation's fiscal year 2012 budget request : hearing before the Subcommittee on Space and Aeronautics, Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, Thursday, May 5, 2011

NASA's commercial cargo providers : are they ready to supply the space station in the post-shuttle era? : hearing before the Subcommittee on Space and Aeronautics, Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, Thursday, May 26, 2011

Lessons from the Soyuz rocket failure and return to flight : hearing before the Subcommittee on Space and Aeronautics, Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, Wednesday, October 12, 2011

A review of the Federal Aviation Administration's research and development program : hearing before the Subcommittee on Space and Aeronautics, Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, first session, February 16, 2011

Proposed changes to NASA's exploration program : what's known, what's not, and what are the issues for Congress? : hearing before the Subcommittee on Space and Aeronautics, Committee on Science and Technology, House of Representatives, One Hundred Eleventh Congress, second session, March 24, 2010

External perspectives on the fiscal year 2010 NASA budget request and related issues : hearing before the Subcommittee on Space and Aeronautics, Committee on Science and Technology, House of Representatives, One Hundred Eleventh Congress, first session, June 18, 2009