Question: Which Microsoft co-founder was involved in the SpaceShipOne space program?

full_context: Document 1: Vulcan Inc.: Vulcan Inc. is a private company founded by philanthropist and investor Paul Allen. It was established in 1986 and oversees Allen's diverse business activities and philanthropic endeavors--from sports teams which include the Seattle Seahawks and the Portland Trail Blazers to conservation projects such as the Great Elephant Census, the Seattle Cinerama, and Museum of Pop Culture.
Document 2: Jody Allen: Jo Lynn "Jody" Allen (formerly Jody Patton) is an American businesswoman and philanthropist. She is Microsoft co-founder billionaire Paul Allen's sister and served as the chief executive officer of his investment and project management company, Vulcan Inc., based in Seattle, Washington until October 2015. She is also the co-founder and president of the Paul G. Allen Family Foundation.
Document 3: History of SpaceX: This is a corporate history of SpaceX, an American aerospace manufacturer and space transport services company founded by Elon Musk.
Document 4: Paul Allen: Paul Gardner Allen (born January 21, 1953) is an American business magnate, investor and philanthropist. He is known for co-founding Microsoft alongside Bill Gates. As of June 2017, he is estimated to be the 46th richest person in the world, with an estimated net worth of $20.7 billion.
Document 5: Ventions: Ventions, LLC is a launch vehicle development company based out of San Francisco, California, that has been working to develop pump-fed, liquid bipropellant propulsion engines for DARPA and NASA. Most recently, Ventions was a technology provider for DARPA's Airborne Launch Assist Space Access (ALASA) program, and is currently working on the Small Air Launch Vehicle to Orbit (SALVO) program, a pathfinder air-launched vehicle for placement of cubesat sized payloads into Low Earth Orbit.
Document 6: Paul H. Allen: Paul Hamilton Allen (1911–1963) was an American botanist noted for his work on the ecology of Central America, orchid systematics and economically important species including bananas. He was married to the former Dorothy Osdieck of Kirkwood, Missouri.
Document 7: SpaceDev: SpaceDev, a part of the "Space Systems Business" of Sierra Nevada Corporation, is prominent for its spaceflight and microsatellite work. It designed and built components for the hybrid rocket motors for Paul Allen's Tier One suborbital SpaceShipOne space program operated by Scaled Composites. It is also developing micro- and nano-satellites, a small expendable launch vehicle, the SpaceDev Streaker, and has designed a piloted suborbital and orbital spaceship of its own, the SpaceDev Dream Chaser, in collaboration with NASA.
Document 8: Bill Gates: William Henry Gates III (born October 28, 1955) is a co-founder of the Microsoft Corporation and is an American business magnate, investor, author and philanthropist.
Document 9: Bill Hilf: Bill Hilf is the Chief Executive Officer (CEO) of Vulcan Inc. He was appointed CEO on 2 December 2016, succeeding Paul Allen. Before becoming CEO of Vulcan Inc., he was the Senior Vice President and General Manager at Hewlett-Packard Enterprise’s Cloud business unit, where he was responsible for engineering, product management, and product marketing. Prior to HPE, Bill spent ten years at Microsoft in a variety of leadership roles.
Document 10: Sierra Nevada Corporation: Sierra Nevada Corporation (SNC) is an American privately held electronic systems provider and systems integrator specializing in microsatellites, telemedicine, and commercial orbital transportation services. Sierra Nevada Corporation operates under the leadership of Chief Executive Officer, Fatih Ozmen and President, Eren Ozmen. The company contracts with the United States Armed Forces, NASA and private spaceflight companies. It is headquartered in Sparks, Nevada.
Document 11: Starchaser Industries: Starchaser Industries is a privately owned company based in the UK whose principal aim is to become a viable business in space tourism. Formed in 1992, the company has designed and built several rocket systems - all prototypes - to investigate the feasibility of producing a space tourism vehicle. Starchaser's rocket NOVA 1, launched in 2001 from Morecambe Bay, still holds the UK record for the biggest successful rocket launch ever fired from the British mainland. Since 2002, Starchaser have operated an Educational Outreach Programme that has grown steadily to become a now major aspect of the company. This arm of the company aims to take traditionally difficult and abstract areas of physics and chemistry and explain their use in rocket building.
Document 12: Stratolaunch Systems: Stratolaunch Systems Corporation is a space transportation venture developing a new air launch to orbit system, with its corporate headquarters located in Seattle, Washington. The project was officially announced in December 2011 by Microsoft co-founder Paul G. Allen and Scaled Composites founder Burt Rutan, who had previously collaborated on the creation of SpaceShipOne.
Document 13: Space Island Group: Space Island Group (SIG) is a commercial organization based in West Covina, CA that is dedicated to the development of commerce, research, manufacturing and tourism in space. They plan to accomplish this by designing, building and operating commercial space transportation systems and destinations. Their flagship project is the Space Island Project. This will be a stand-alone commercial space infrastructure supporting manned business activities in Low Earth Orbit (LEO) 400 to 500 miles above earth. They plan to accomplish this through the use of technologies, vehicles and procedures developed by NASA and aerospace companies over the last 25 years.
Document 14: SpaceX reusable launch system development program: The SpaceX reusable launch system development program is a privately funded program to develop a set of new technologies for an orbital launch system that may be reused many times in a manner similar to the reusability of aircraft. The company SpaceX is developing the technologies over a number of years to facilitate full and rapid reusability of space launch vehicles. The project's long-term objectives include returning a launch vehicle first stage to the launch site in minutes and to return a second stage to the launch pad following orbital realignment with the launch site and atmospheric reentry in up to 24 hours. SpaceX's long term goal is that both stages of their orbital launch vehicle will be designed to allow reuse a few hours after return.
Document 15: Allen &amp; Company Sun Valley Conference: The Allen & Company Sun Valley Conference is an annual media finance conference hosted and wholly independently funded by private investment firm Allen & Company. The conference has taken place in Sun Valley, Idaho for one week each July since 1983. The conference typically features business leaders, political figures, and major figures in the philanthropic and cultural spheres. Previous conference guests have included Bill and Melinda Gates, Warren and Susan Buffett, Tony Blair, Google founders Larry Page and Sergey Brin, Allen alumnus and former Philippine Senator Mar Roxas, Google Chairman Eric Schmidt, Yahoo! co-founder Jerry Yang, Facebook founder Mark Zuckerberg, Media Mogul Rupert Murdoch, eBay CEO Meg Whitman, BET founder Robert Johnson, Time Warner Chairman Richard Parsons, NBA player LeBron James, Governor Chris Christie, entertainer Dan Chan, Katharine Graham of "The Washington Post", Diane Sawyer, InterActiveCorp Chairman Barry Diller, Linkedin co-founder Reid Hoffman, Sandro Salsano from Salsano Group, and Washington Post CEO Donald E. Graham, and Oprah.
ground_truth: Paul Allen