Jon Stephenson von Tetzchner (born August 29 1967 in Reykjavík, Iceland) is the CEO of Opera Software. He and Geir Ivarsøy were part of a research group at the Norwegian state phone company (now known as Telenor) where they developed browsing software called MultiTorg Opera. The project was abandoned by Telenor, but Geir and Jon obtained the rights to the software, formed a company of their own, and continued working on it. Now known simply as Opera, the internet browser has become very popular despite the competition. Opera Software has grown to over 500 employees since it first moved to its present offices in Oslo.
On Thursday, April 21 2005, he proclaimed that if the download numbers of the browser's new version Opera 8 reached 1 million within four days, he would swim across the Atlantic Ocean from Norway to the United States. The million was reached, Opera Software announced that von Tetzchner will "stand by his word". On April 25 and April 26, the official Opera site described the nonserious Atlantic swim "attempt" and its quick and comical "failure". For Tetzchner's 40th birthday on August 29 2007, Opera Software announced that it would release the first public alpha of Kestrel. His biggest birthday wish was to give the community a preview of Kestrel, which has been in development for over a year.