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Karl Denninger

December 2, 2019


Karl Denninger is an American technology businessman, finance blogger, and political activist, sometimes referred to as a founding member of the Tea Party movement.

Denninger was the founder and CEO of MCSNet in Chicago. Opened as Macro Computer Solutions, Incorporated in 1987, it expanded its service offerings in 1993 to become one of the area’s first commercial internet service providers. Among its customers was the Chicago Public Library, which relied on MCSNet for both internet access and web hosting. In 1997 he led a coalition of ISPs in setting up the Enhanced Domain Name System, a short-lived alternative DNS root which allowed registrants to add their own generic top-level domains. Denninger continued to run MCSNet until August 1998, when he sold it to Winstar Communications for an undisclosed amount. For his efforts, the Chicago Sun-Times dubbed him one of “the movers and shakers who brought Chicago into the Internet Age”. After the sale of MCSNet, he moved to Florida, where he began to devote more time to stock trading and political activism.