Koo entered politics in 1991,[1] when he was elected via walkover as a MP for Tanjong Pagar GRC.
In 1995, Koo became a parliamentary secretary and was promoted to senior parliamentary secretary in 1999.[1] As parliamentary secretary, he had worked in various ministries, including Finance, National Development, Defence, and Environment and Water Resources. Koo was promoted to Minister of State in the Ministry of Defence in May 2006.[2]
The party affiliation of each member is indicated right after the constituency he or she represents. PAP: People's Action Party; SDA: Singapore Democratic Alliance; WP: The Workers' Party NMPs do not belong to any party. There were two terms of NMPs in this parliament, with nine NMPs in each term.