Managed detection and response (MDR) emerged as an innovative offering that substantially disrupted the status quo in managed security services. MDR led to higher levels of customer satisfaction, reduced dwell times for adversaries, and rapid growth for service providers. Security and risk pros can use this report to understand the evolution of MDR, examine the adjacent services and potential roadmap items that most closely complement it, and advocate for the continuation of the capabilities that formed the roots of this collaborative service that delivers superior detection and response for customers.