Dave Winer is one of the pioneers of the software industry. He singlehandedly developed and popularized outliners as a software category and later helped develop XML-RPC, SOAP and RSS.
There's a good interview on NerdTV where Robert X. Cringely interviews Winer and discusses topics such as outlining, the early days of the software industry, why programmers don't always get it, the development and evolution of OSS, publishing on the internet and more. Dave's not known for being a shrinking violet; he has strong views on a lot of technologies. But love him or hate him, he's had huge impact on software in the last ten years.