Eddie Teo Chan Seng PPA(E) PJG DUBC DUNU (Chinese: 张赞成; pinyin: Zhāng Zànchéng) is a Singaporean civil servant who has been serving as Chairman of the Council of Presidential Advisers since 2019.
A President's Scholar, Teo graduated from the University of Oxford in 1970 with a Bachelor of Arts degree in philosophy, politics and economics (PPE).
He subsequently went to complete a Master of Science degree in international relations at the London School of Economics in 1974.
Teo joined the Security and Intelligence Division (SID) in 1970, before becoming Director in 1979, a post he served until 1994.
Teo was appointed as Chairman of the Council of Presidential Advisors on 2 January 2019.