Vice Admiral Griggs was born in Homebush NSW in 1961. He joined the Adelaide Port Division of the Royal Australian Navy Reserve in 1978 as a radio operator and entered the Royal Australian Naval College at HMAS Creswell on a short service commission in 1979. He was appointed Vice Chief of the Defence Force on 30 June 2014.
During his seaman officer training Vice Admiral Griggs served in the aircraft carrier HMAS Melbourne and HMA ships Yarra and Advance before spending 12 months loaned to the Royal Navy in HMS Jersey to gain his Bridge Watchkeeping Certificate. In late 1981 he was posted to HMAS Perth as a Bridge Watchkeeper and deployed to the North West Indian Ocean in support of Australia's independent presence in that region following the Soviet invasion of Afghanistan.
From 1983 to 1994 the then Lieutenant Griggs completed a series of postings as Navigating Officer of HMA Ships Cessnock, Torrens, Tobruk, Jervis Bay and Perth. Between 1995 and 1997 Vice Admiral Griggs served as commissioning Executive Officer of HMAS Anzac helping to bring the Anzac class into service. In October 2001 he assumed command of the Anzac Class frigate HMAS Arunta and was immediately involved in border protection duties as part of Operation RELEX. In 2004 he studied at the National War College in Washington DC prior to assuming command of the Australian Amphibious Task Group in mid-2005. He was promoted to Commodore in February 2006 and in May 2010 he was posted as Deputy Chief of Joint Operations during a high tempo period of operations abroad and at home. He then went on to command of the Royal Australian Navy from June 2011 until June 2014.
Vice Admiral Griggs was awarded the Conspicuous Service Cross in 1997, a Commendation for Distinguished Service in 2003 for his work in the Persian Gulf and appointed as a Member of the Order of Australia in 2009. He was made an Officer of the Order of Australia in 2012. He holds a Bachelor of Arts degree from the University of Queensland, a Master of Business Administration from the National Graduate School of Management at the Australian National University and a Master of Science (National Security Strategy) from the National Defense University in Washington DC.