Philip Moss joined the Australian Public Service in 1975 and was appointed to the Senior Executive Service in 1988.
During his public service career, Mr Moss was at one time an acting Assistant Secretary in the Human Rights Commission, Assistant Inspector-General of Intelligence and Security, an Assistant Secretary in the Department of the Prime Minister and Cabinet and later a Senior Assistant Ombudsman. Subsequently, Mr Moss was the Australian Capital Territory Health Services Commissioner.
In July 2007, Mr Moss was appointed Integrity Commissioner and head of the Australian Commission for Law Enforcement Integrity.
Mr Moss was admitted to legal practice in New South Wales in 1991.