After completing the original trilogy with leading-lean-software-development-2009, mary-poppendieck and tom-poppendieck continued their influence through conference keynotes, LeanEssays.com, consulting, and a fourth book: The Lean Mindset (2013).
This era saw lean software principles absorbed into mainstream practice through multiple downstream movements. gene-kim's DevOps work, jez-humble's continuous delivery, and david-anderson's Kanban method all operationalized Poppendieck concepts into specific practices and tools. The Poppendiecks themselves moved toward broader organizational and innovation themes, engaging with topics like microservices, containers, and platform architecture in conference talks (QCon, GOTO, O'Reilly Software Architecture).
Mary continued presenting keynotes through 2020, including at Agile India and O'Reilly's Software Architecture Conference, where she discussed dramatic architectural shifts in software. Her 2015 backstory essay provided the definitive account of lean software development's intellectual origins. The Grown-Up Lean essay reflected on two decades of lean software adoption.