In 1991, he was co-founder of the first commercial internet service provider in Norway, Oslonett, which later, being acquired by Schibsted, became Schibsted Nett (SN), and Scandinavia Online (Sol). He later co-founded other Internet-related businesses.[example needed]
Through books, articles and regular columns in the press, Hannemyr has been active in describing and explaining not only the Internet, but also hacker culture to the public. In the public eye, he is regarded as Norway's foremost net guru and evangelist, and is the primary spokesperson for free software, free media formats and open net usage in Norwegian media.
In 2002, Hannemyr was awarded the Norwegian Computer Society's Rosing Academy's Rosing's Honour Award, and in 2003, a vote among the Norwegian members of First Tuesday (an association of entrepreneurs and investors) declared him Internet personality of the decade.
- Technology and Pleasure: Considering Hacking Constructive, First Monday, Volume 4, Number 2 - 1 February 1999
- Gisle Hannemyr, internet personality of the decade, Verdens Gang, 15 May 2003 (in Norwegian)
- Rosing-award to Gisle Hannemyr, Digi.no, 20 November 2002 (in Norwegian)