He has been a Labor Party member of the Western Australian Legislative Assembly since the 2008 state election, representing Gosnells until 2017 and Thornlie thereafter.

Prior to the election, Tallentire was the Director of the Conservation Council of Western Australia from March 2004 to April 2008.

[2] In September 2024, Tallentire raised concerns regarding amendments to legislation relating to the Environmental Protection Authority.

[5] As such, the CEO of Wungening Aboriginal Corporation, Daniel Morrison-Bird, was endorsed by Tallentire and the Labor Party as its candidate for the seat of Thornlie in the 2025 election.

[7] This article about an Australian Labor Party member of the Parliament of Western Australia is a stub.