Marian Petre 'picks the brains' of expert software developers to understand what makes them expert. She has spent decades studying how they reason and communicate about design and problem-solving. By observing, talking to, and working with hundreds of professional software developers in organisations ranging from start-ups to the world's major software companies, she exposes actionable insights into the thinking that distinguishes high-performing teams. Petre is an Emeritus Professor at the Open University (UK) and a Visiting Distinguished Professor at University of California, Irvine. Her most recent book is "Software Design Decoded" (MIT Press), and she received a Royal Society Wolfson Research Merit Award in recognition of her work.