Ian MacMillan

Discovery-Driven Planning, entrepreneurial strategy

Emeritus professor at the Wharton School, University of Pennsylvania, where he held the Dhirubhai Ambani Chair in Innovation Management. He co-developed Discovery-Driven Planning with Rita McGrath, a methodology that treats new ventures as assumption-testing exercises rather than fixed forecasts. His work on entrepreneurial strategy and 'The Entrepreneurial Mindset' shaped how firms approach high-uncertainty growth initiatives.