Matthew John Kean (born 16 September 1981) is an Australian politician, who has served as the Treasurer of New South Wales in the second Perrottet ministry of New South Wales since October 2021. He has also served as the Minister for Energy since April 2019 and as Deputy Leader of the Liberal Party since August 2022. He has represented Hornsby for the party in the New South Wales Legislative Assembly since 2011.
Kean previously served as the Minister for Innovation and Better Regulation from January 2017 until March 2019 in the first Berejiklian ministry and as the Minister for Environment from April 2019 until December 2021 in the second.
Kean grew up in the Wahroonga area and was educated at Saint Ignatius' College, Riverview before attaining a Bachelor of Business from the University of Technology, Sydney. He later completed a graduate diploma at the Institute of Chartered Accountants. While at university, he was elected to the UTS Student Representative Council and as the SRC Executive Member for the Haymarket Campus. Kean has been a member of the Liberal Party since 2001, and in 2008, he was elected vice-president of the NSW Young Liberals. During the 2003 State election campaign, Kean worked as an adviser for the Leader of the Opposition, John Brogden. He subsequently worked for Catherine Cusack MLC as an adviser while she was shadow minister for Juvenile Justice and Women.

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