For other people named Michael Seifert, see Michael Seifert.Michael Seifert (born February 1969 in Copenhagen) is a Danish computer programmer, inventor, businessman, and entrepreneur in the IT industry. He is co-developer of DikuMUD, a popular multiplayer text-based role-playing game codebase, and chief executive officer of Sitecore, a global customer experience management software company, which he co-founded in Copenhagen, Denmark in 2001.