Charles Simonyi (/sɪˈmoʊni/; Hungarian: Simonyi Károly, pronounced [ˈʃimoɲi ˈkaːroj]; born September 10, 1948) is a Hungarian-American software architect. He started and led Microsoft's applications group, where he built the first versions of Microsoft Office. He co-founded and led Intentional Software (acquired by Microsoft in 2017), with the aim of developing and marketing his concept of intentional programming. As of November 15, 2022, Simonyi's net worth is US$5.2 billion.