Karl Lehenbauer (born April 5, 1958) was the founder of in the early 1990s, which was the first Internet Service Provider in the southern United States as well as the first to offer cable modem service in Houston, Texas, among other technological milestones. NeoSoft was later sold to Internet America in 1999. Lehenbauer also wrote the Internet (socket) capabilities of the Tcl programming language. Lehenbauer was the CTO of FlightAware, an aviation data and flight tracking company, from 2005 to 2021.