• ISDC: A Code of Ethics for Off-Earth Commerce (updated)
    ISDC 2003, National Space Society, May 24, 2003
  • IAA: A Code of Ethics for Off-Earth Commerce
    World Space Conference, October 16, 2002.
  • Space Tourism After Dennis Tito
    The Mars Society August 26, 2001 and Space 2002, March 18, 2002.
  • The Prospects for Sapce Commerce in the Aftermath of 9/11
    Mars Society Conference, August 10, 2002.
  • How Best To Talk With The Public About Mars, Space Tourism, And Space Commerce
    Mars Society Conference, August 10, 2002
  • A Code of Ethics for Off-Earth Commerce
    Space and Robotics 2002, March 17, 2002.
  • A Code of Ethics for Martian and Off-Earth Commerce
    The Mars Society, August 23, 2001
  • A Code of Ethics and Standards for Lunar Development and Outer Space Commerce
    Lunar Development Conference, Space Frontier Foundation, July, 2001.
  • Barriers to Space Enterprise
    The Cato Institute, March 15, 2001.
  • Space Tourism and RLVs: You Can't Have One Without the Other!
    IAA Rio Conference, Fall 2000.
  • From Earth to Mars: A Cooperative Plan
    The Mars Society, August 10, 2000.
  • $pace: The Final Financial Frontier
    The Mars Society, August 10, 2000.
  • Lunar Ethics and Space Commercialization
    Lunar Development Conference, Space Frontier Foundation, July 2000.
  • The Ethical Commercialization of Outer Space
    The Mars Society, August 14, 1999 and Space 2000, February/March 2000.
  • The Obstacles to Financing New Space Industries
    The Mars Society, August 13, 1999.
  • The Business of Commercializing Space
    The Mars Society, August 13, 1998.