Jeff Gothelf has been speaking about Lean UX, writing a book on it, and enthusiastically championing the practice within Agile environments like

He’s built his renowned career as a UX designer and information architect designing elegant, efficient, and sophisticated products that are used by millions of people via AOL, Webtrends, and Fidelity.

Today, he’s running Proof, a Lean UX consultancy that helps both organizational teams and independent clients get the design solutions that solve real problems and gets designers out of the deliverables business.