Crystal Hirschorn, VP of Engineering at Condé Nast, presented at Chaos Conf 2019, discussing the evolution and future of Chaos Engineering in identifying "unknown unknowns" within complex systems. She emphasized the importance of resilience engineering and leveraging tools like Kubernetes and AWS to manage global operations with substantial technical challenges, especially in complex and multi-tenant architectures. Hirschorn highlighted the necessity of robust observability practices for effective chaos experiments, advocating for continuous verification and diverse post-incident reviews to improve organizational learning and system reliability. She also addressed the challenges of working within varying geopolitical environments and the need for adaptive management and engineering practices to handle the complexities of modern software architectures.