Ian B. MacNeill, an outstanding statistician of our times, passed away on January 16, 2019. He left the legacy of fundamental contributions to change‐point and forecasting methodology, environmetrics, and health statistics. He was an integral part of building The International Environmetrics Society and its journal Environmetrics. He was a thoughtful visionary scientist and a caring mentor for students and faculty. We were fortunate to record the conversation with Ian when all three of us were participating in the 2016 annual meeting of the Statistical Society of Canada. At the meeting, a special session was organized to honor Ian MacNeill in celebration of his 85th birth year. This conversation took place between Ian MacNeill, Krishna Jandhyala, and Elena Naumova at the Four Points by Sheraton, Niagara Suites on June 1, 2016. [ABSTRACT FROM AUTHOR]