Open Spectrum International is a a nonprofit media network founded by Robert Horvitz in August 2004. They aim to "try to persuade telecom regulators to let the public use more of the radio spectrum without a license." 
- "In the summer of 2004, a project named Open Spectrum International began under the auspices of Czech Civic Association "Mista v Srdce." The aim was to promote awareness of "open spectrum" concepts outside North America, and to advocate the expansion of the radio bands available for license-exempt use. As we grew, it became clear that we needed an independent legal basis for our work. So in May 2005, we registered as a Dutch nonprofit foundation ("stichting") with offices in Amsterdam and Prague: Stichting Open Spectrum translates into English as the Open Spectrum Foundation." 
- Dewayne Hendricks - CEO, The Dandin Group, Inc.; member of the US Federal Communications Commission's Technological Advisory Council; member of the board of directors of the Wireless Communications Alliance.
- Michael Marcus - recently retired as the FCC's Associate Chief for Technology and the Senior Technical Advisor to the FCC's Spectrum Policy Task Force.
- Jonathan Marks
- Eli M. Noam
- Onno W. Purbo
- Kevin Werbach
National Open Spectrum groups
- Website: http://www.openspectrum.info/