Enhancing the relevance of space to address national needs : hearing before the Subcommittee on Space and Aeronautics, Committee on Science and Technology, House of Representatives, One Hundred Eleventh Congress, first session, July 16, 2009

The growth of global space capabilities : what is happening and why it matters : hearing before the Subcommittee on Space and Aeronautics, Committee on Science and Technology, House of Representatives, One Hundred Eleventh Congress, first session, November 19, 2009

The International Space Station : addressing operational challenges : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Fourteenth Congress, first session, July 10, 2015

Key issues and challenges facing NASA : views of the agency's watchdogs : hearing before the Subcommittee on Space and Aeronautics, Committee on Science and Technology, House of Representatives, One Hundred Eleventh Congress, second session, February 3, 2010

America in space : future visions, current issues : hearing before the Committee on Science, Space, and Technology, House of Representatives, One Hundred Sixteenth Congress, first session, March 13, 2019

Securing the promise of the International Space Station : challenges and opportunities : hearing before the Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, second session, Wednesday, March 28, 2012

Commercial space : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Thirteenth Congress, first session, November 20, 2013

Examining NASA's development on the space launch system and Orion crew capsule : hearing before the Subcommittee on Space and Aeronautics, Committee on Science, Space, and Technology, House of Representatives, One Hundred Twelfth Congress, second session, Wednesday, September 12, 2012

Regulating space : innovation, liberty, and international obligations : hearing before the Subcommittee on Space, Committee on Science, Space, and Technology, House of Representatives, One Hundred Fifteenth Congress, first session, March 8, 2017

NASA'S fiscal year 2010 budget request : hearing before the Committee on Science and Technology, House of Representatives, One Hundred Eleventh Congress, first session, May 19, 2009