Dean Leffingwell

Dean Leffingwell, software industry veteran and Lean Systems Society Fellow, has spent his career helping software teams achieve their goals. A renowned methodologist, author, coach, entrepreneur and executive, he founded Requisite, Inc., which was acquired by Rational Software. At Rational, (now part of IBM), he served as vice president with responsibilities including the Rational Unified Process. As Chief Methodologist at Rally Software, he helped large enterprises achieve the business benefits of agility by helping to define and implement the tooling and practices they needed to support large-scale agile development.  Mr. Leffingwell is the author of Agile Software Requirements, Scaling Software Agility, and Managing Software Requirements. His most recent project is the Scaled Agile Framework® (, a public-facing knowledge base which describes a comprehensive system for scaling Lean and Agile practices to the largest software enterprises.