Charles Simonyi (Hungarian: Simonyi Károly, born September 10, 1948) is a Hungarian-born American software architect. He started and led Microsoft's applications group, where he built the first versions of Microsoft Office suite of applications. He co-founded and led Intentional Software (acquired by Microsoft in 2017), with the aim of developing and marketing his concept of intentional programming. In April 2007, aboard Soyuz TMA-10, he became the fifth space tourist and the second Hungarian in space. In March 2009, aboard Soyuz TMA-14, he made a second trip to the International Space Station. His estimated net worth is US$3.3 billion.