Tien joined UC Berkeley faculty as an assistant professor of mechanical engineering in 1959, and three years later, at the age of 26, became the youngest professor ever to be honored with UC Berkeley's Distinguished Teaching Award. He was promoted to full professor in 1968 and served as the Chair of the Department of Mechanical Engineering from 1974 to 1981. From 1983 to 1985, he served as vice chancellor of research. Tien spent his entire career at Berkeley, except for 1988–90 when he was executive vice-chancellor of UC Irvine. In 1999, Tien received the prestigious title of "University Professor". Tien was an expert in thermal science and researched on thermal radiation, thermal insulation, microscale thermal phenomena, fluid flow, phase-change energy transfer, heat pipes, reactor safety, cryogenics, and fire phenomena, authoring more than 300 research journal and monograph articles, 16 edited volumes, and one book. As chancellor, Tien was a leading supporter of affirmative action. After the Regents banned the use of racial preferences in 1995 for university admissions, Tien launched the "Berkeley Pledge," an outreach program designed to recruit disadvantaged students from the state's public schools. Amid an 18% budget cut, Tien launched "The Promise of Berkeley – Campaign for the New Century", a fundraising drive that raised $1.44 billion. Known for his "Go Bears!" spirit, Tien was very popular with students, often showing up at student rallies and sporting events wearing his "Cal" baseball cap. He was commonly seen picking up trash in Sproul Plaza, appearing in the library in the middle of the night during finals week, or checking up on students in the residence halls and classrooms. Tien was a member of the National Academy of Engineering, the Academia Sinica, the American Academy of Arts and Sciences, the American Association for the Advancement of Science, the American Institute of Aeronautics and Astronautics, the American Society of Mechanical Engineers, and the Chinese Academy of Sciences.
Personal life
During his residency in the United States, Tien became an American citizen. Shortly before instruction for the 1992–93 academic year started, a young woman named Rosebud Denovo was killed by police after she broke into the Chancellor's Mansion, during an apparent assassination attempt. Tien and his family were unharmed. Tien died in Redwood City, California at the age of 67. A brain tumor had forced him into hospitalization two years earlier; while hospitalized, he suffered a stroke from which he never fully recovered. He was survived by his wife Di-Hwa, his son Norman Tien Ph.D., currently Dean of the Faculty of Engineering at the University of Hong Kong since June 2012, and daughters Christine Tien, Stockton's deputy city manager, and Dr. Phyllis Tien, a UC San Francisco physician. All of his children are graduates of Berkeley High School).
Legacy
Asteroid "Tienchanglin", discovered by the Zi Jin Mountain Observatory in China in 1978, was formally named for the former chancellor in 1999.
Oil tanker was christened in 2000 for the Chevron Corporation. It was subsequently renamed to after being sold to Space Shipping in 2003, then after being sold to Maran Tankers in 2014.