Stephen is proud to live in the western suburbs with his wife Antonia and their children Benjamin, Isaac and Olivia.

He was first elected as the Member for Lee in the South Australian Parliament in March 2014, and was Minister for Transport & Infrastructure, Minister Assisting the Minister for Planning, Minister Assisting the Minister for Housing and Urban Development later that month.

In 2016, Mr Mullighan was also appointed the Minister for Housing and Urban Development.

Prior to his appointment as Minister, Mr Mullighan led Deloitte’s economics team in Adelaide between 2010-2013, providing economic advice to corporate clients, non-profit sector and state and federal governments.

He holds a Bachelor of Arts degree from the University of Adelaide.

Mr Mullighan was returned as the Member for Lee at the 2022 South Australian Election and currently serves as the Treasurer in the Malinauskas Labor Government.