I was not Agile before there was Agile. I was a Computer Science major that hired into a CPA and consulting firm right out of college. We followed a waterfall process. Plans, contracts, and process were paramount. Working software came late, and when push came to shove, manual testing got cut short. That was how I worked for a decade.
I got introduced to Agile as part of a career transition. I served as Scrum Master for both collocated and distributed teams. Collaboration with other Scrum Masters provided the first taste of "coaching." When the corporation announced the closure of our office location, I sought opportunities in other organizations that were also transitioning to, or practicing, Agile methods. That set me on a course that lead to more Agile coaching, filling that role as both a consultant and employee.
Continuous learning and engagement with others in the Agile community has been key to continuing to develop and provide value as a professional.