James L. Pulley III is a software performance engineer and author whose work explores performance measurement as an engineering discipline rather than a testing activity. With more than three decades of experience in large-scale software systems, his writing examines how technical evidence is produced, evaluated, and used in organizational and operational decision-making. Pulley has worked across enterprise environments, regulated industries, and mission-critical systems, with an emphasis on reproducibility, auditability, and long-term accountability. He is the founder of PerfBytes, a professional community supporting performance engineering practice, and host of the PerfBytes podcast. James L. Pulley III resides in South Carolina.