Abstract This article reflects on the author's research career, which has focused on heat and energy. It details the challenges faced by the author and his research group, highlights their successes and failures, and explores some intriguing unresolved questions in the fields of heat transfer and energy. The author's career has been significantly shaped by his mentors, students, associates, collaborators, and the opportunities to tackle problems at the intersection of heat transfer, materials science, and physics. Additionally, the article discusses the research philosophy imparted by his PhD advisor, Chang-Lin Tien, and the influence of MIT's research culture. It also offers career advice for students, as well as early- and mid-career researchers.