Charles Simonyi (, ; born September 10, 1948), son of
Károly Simonyi, is a Hungarian-born American space tourist, computer programmer, and businessman. He was head of
Microsoft's application software group, oversaw the creation of
Microsoft's flagship Office suite of applications. He now heads his own company,
Intentional Software, 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$1.4 billion.