Gregory John Sammut, of Maltese descent, has made a name for himself in the Australian Army.

Born in Sydney in 1966, he fulfilled a long-held ambition to join the Royal Australian Navy and entered the RAN College in 1984. Having completed an honours degree in electrical engineering in 1987, he subsequently completed seaman officer training before qualifying as a submariner in 1991 and then obtaining his submarine command qualification in 1996.

Greg Sammut served as the commanding officer of the Collins class submarine, HMAS Farncomb for which he was awarded a Conspicuous Service Cross (CSC) in 2001. He has also commanded the Anzac class frigates HMA Ships Ballarat and Toowoomba. From June to November 2006, he was Commander Task Group 158.1, directly responsible to the Commander of Coalition Forces in the Northern Arabian Gulf. For this service he was awarded a Commendation for Distinguished Service in 2008.

More recently he was Commander Combined Task Force 150 from October 2010 to April 2011, during which he commanded operations of the maritime counter-terrorism task force of Combined Maritime Forces in the Middle East Area of Operations.

His shore duties have included Commander Submarine Sea Training, Chief Staff Officer–Operations in Fleet Command, Director Submarine and Specialist Ship Development within Capability Development Group, Chief of Staff to Chief of Navy, and Director General Submarine Capability within Navy Strategic Command. Promoted to rear admiral in September 2013, Greg Sammut assumed duties as Head Future Submarine Program.

He was made a Member of the Order of Australia (AM) in January 2016 for exceptional performance of duty as the Head Future Submarine program, the Director General Submarine Capability and the Director Submarine and Specialist Ship Development.

He is a graduate of both the Royal Australian Navy Staff College and the US Naval Command College in Rhode Island. Rear Admiral Sammut also holds a masters degree in business administration.