Teo Chee Hean (; born 27 December 1954) is a Singaporean politician and former two-star rear-admiral who has been serving as Senior Minister of Singapore since 2019 and Coordinating Minister for National Security since 2015. A member of the governing People's Action Party, he has been the Member of Parliament (MP) representing the Pasir Ris West division of Pasir Ris–Punggol GRC since 2001. A recipient of the President's Scholarship and Singapore Armed Forces Overseas Scholarship, Teo served in the Republic of Singapore Navy (RSN) between 1972 and 1992, and attained the rank Rear-Admiral (Two-Star). He served as Chief of Navy between 1991 and 1992 before leaving the Navy and entering politics. He made his political debut in the 1992 by-election in Marine Parade GRC as part of a four-member PAP team. He had served as Deputy Prime Minister between 2009 and 2019, Minister for the Environment between 1995 and 1997, Minister for Education between 1997 and 2003, Minister for Defence between 2003 and 2011 and Minister for Home Affairs between 2011 and 2015. Teo was part of the ministerial committee of the Smart Nation and Digital Government Group (SNDGG). As Senior Minister, Teo had served as acting prime minister in several occasions, during Prime Minister Lee Hsien Loong's absence. Within the PAP, Teo was First Assistant Secretary-General in the party's Central Executive Committee (CEC) before he was succeeded by Heng Swee Keat in November 2018. Education Teo was educated at St. Joseph's Institution before he was awarded the President's Scholarship and Singapore Armed Forces Overseas Scholarship in 1973. He graduated from the University of Manchester in 1976 with a Bachelor of Science with first class honours degree in electrical engineering and management science. He subsequently went on to complete a Master of Science with distinction degree in computing science at Imperial College London in 1977. He also completed a Master of Public Administration degree at Harvard University's John F. Kennedy School of Government in 1986, where he was named a Littauer Fellow. Career Military career Teo joined in the Singapore Armed Forces (SAF) in 1972 and was commissioned as a naval officer at the SAFTI Military Institute in 1973. He went on to hold various command and staff appointments in the Republic of Singapore Navy (RSN) and the Joint Staff before his appointment as Chief of Navy in 1991 with the rank of Rear-Admiral (Two-Star) before leaving the SAF on