Jeff Sutherland and Ken Schwaber were the key figures in the early development of Scrum. They collaborated extensively on refining and improving Scrum, leading up to their co-presentation of Scrum at the OOPSLA Conference in 1995. This event was significant as it publicly shared their accumulated learnings and presented the first formal definition of Scrum.
Their collaboration continued beyond the conference, resulting in the creation of the Scrum Guide in 2010. This guide aimed to document Scrum comprehensively as it had evolved over the years, providing a clear reference for practitioners worldwide.