The term Professional Dangerousness was first introduced by Peter Dale in 1984 within child protection literature.

It was later expanded and operationalized by Tony Morrison in the 1990s through his work in reflective supervision and safeguarding practice.

While originally rooted in child protection contexts, the concept has since broadened in scope. The PD Collective builds upon this foundation, extending its application across human service systems, leadership structures, and interdisciplinary practice.