Please note that Directory.gov.au is being progressively updated following the 2025 Federal Election, the Administrative Arrangements Order (AAO) on 13 May 2025 and the amendment to the AAO on 26 July 2025.

Your guide to the structures, organisations and key people in the Australian Government

Secretary's Office

Key People

A/g Secretary of the Department of Climate Change, Energy, the Environment & Water

Mr. Simon Duggan

simon.duggan@dcceew.gov.au

https://www.dcceew.gov.au/
Senior Executive Assistant to the A/g Secretary

Ms. Lydia Milosavljevic

02 5162 2756

lydia.milosavljevic@dcceew.gov.au

https://www.dcceew.gov.au/

GPO Box 3090 Parkes ACT 2600 Australia
Chief of Staff to the Secretary

Dr. Peta Derham

peta.derham1@dcceew.gov.au

https://www.dcceew.gov.au/

0477 342 114
Deputy Chief of Staff

Mr. John Su

john.su1@dcceew.gov.au

0421 179 962

Last updated: 20 July 2022