Jon Stephenson von Tetzchner (Icelandic: Jón; born 29 August 1967 in Seltjarnarnes) is an Icelandic-Norwegian programmer and businessman.

Tetzchner went to secondary school at the Menntaskólinn í Reykjavík before continuing his studies in Norway, where he made his career.

[7][8] Under his leadership, Tetzchner turned Opera Software into a global company with more than 750 employees in 13 countries.

In January 2010, Tetzchner stepped down as Chief Executive Officer of Opera Software, but he continued to serve the company as a strategic adviser.

[10] In December 2013, Tetzchner founded the company Vivaldi Technologies and launched the online community site vivaldi.net, which includes a forum, blogs, chat, photo sharing and a free email service named Vivaldi Webmail.