Mr. O'Brien has served as senior vice president of A. O. Smith and president and general manager of North America Water Heating since 2024. He previously served as senior vice president and president of Lochinvar, LLC from 2022 to 2024 and as its chief operating officer from 2021 to 2022, and earlier was senior vice president at Mitsubishi Electric Trane US from 2017 to 2021.