David S. C. Chu (朱思九; pinyin: Zhū Sījiǔ; born May 28, 1944) is a retired American civil servant and consultant.

David S. C. Chu
朱思九
United States Under Secretary of Defense for Personnel and Readiness
In office June 1, 2001 – January 20, 2009
President	George W. Bush
Preceded by	Bernard D. Rostker
Succeeded by	Clifford L. Stanley
United States Assistant Secretary of Defense for Program Analysis & Evaluation
In office May 19, 1981 – January 20, 1993
President	Ronald Reagan George H. W. Bush
Preceded by	Russell Murray II
Succeeded by	William J. Lynn III
Personal details
Born	(1944-05-28) May 28, 1944 (age 79) New York, New York, U.S.
Spouse	Laura L. Tosi
Children	2
Alma mater	Yale University (BA, PhD)
Military service
Allegiance	United States
Branch/service	United States Army
Years of service	1968–1970
Rank	Captain
Battles/wars	Vietnam War

He was born in New York, New York on May 28, 1944.^[1] He served as the President and CEO of the non-profit Institute for Defense Analyses from 2009 to 2019. From 2001 to 2008, he served as Under Secretary of Defense for Personnel and Readiness in the George W. Bush administration.^[2]

Chu received a Bachelor of Arts Degree, magna cum laude, in Economics and Mathematics from Yale University in 1964 and a PhD in Economics, also from Yale, in 1972 following a break due to military service.^[3] In 1968 he was commissioned in the United States Army and became an instructor at the U.S. Army Logistics Management Center, Fort Lee, Virginia. He later served a tour of duty in the Vietnam War, working in the Office of the Comptroller, Headquarters, 1st Logistical Command. He obtained the rank of captain and completed his service with the Army in 1970.^[2]

From 1978 to 1981, Chu served as the Assistant Director for National Security and International Affairs, Congressional Budget Office, providing advice to the Congress on the full range of national security and international economic issues. He was Director, Program Analysis and Evaluation and then Assistant Secretary of Defense (Program Analysis and Evaluation) from May 1981 to January 1993. In that capacity, he advised the Secretary of Defense on the future size and structure of the armed forces, their equipment, and their preparation for crisis or conflict.^[2]

From 1993 to 2001, Chu served in several senior executive positions with the RAND Corporation, including Vice President and Director of the Arroyo Center, the Army's federally funded research and development center for studies and analysis, and Director of RAND's Washington Office.^[2]

Chu was appointed on June 1, 2001 as Under Secretary of Defense for Personnel and Readiness. In that position, he was responsible as the senior policy advisor on recruitment, career development, pay and benefits, and overseeing the state of military readiness. He left that position in 2008, and joined the Institute for Defense Analyses as President and CEO.^[2]

He is a fellow of the National Academy of Public Administration and a recipient of its National Public Senior Award. He holds the Department of Defense Medal for Distinguished Public Service with silver palm.^[2]

Chu's father came from China to study at the University of Illinois, during World War II he worked for the China News Service^[which?] and afterwards went to work for the United Nations. His mother's family came to America before the Revolutionary War. Chu's brother was chairman of the music department at Hamline University and his sister is a human resources executive at Kent State University.^[4]