Mary Poppendieck is co-author (with tom-poppendieck) of "Lean Software Development: An Agile Toolkit" (2003) and subsequent lean software books. The Poppendiecks cite Reinertsen extensively as providing the economic justification for lean practices in software development.
Their work bridges taiichi-ohno's Toyota Production System and Reinertsen's cost-of-delay framework into actionable software development practices. Mary brought deep manufacturing and lean background; together with Tom they translated the economic logic underlying batch-size-reduction and flow optimization into the software domain. Their work was an important vector through which Reinertsen's ideas reached the agile and lean software communities in the early 2000s. The key text documenting this transmission is poppendieck-lean-software-development, which cites Reinertsen extensively on cost-of-delay and economic-framework-for-prioritization.