Prior to entering parliament Angus appeared before the Australian Competition Tribunal as an expert economist in the historic Pilbara rail access case, and appeared before the Senate Inquiry into the fertiliser industry. Angus also served on the Council of St Andrew's College for 15 years, and was a member of the Finance Committee of the New South Wales Liberal Party.
After leaving University, in 1994 Angus began working for global management consulting firm McKinsey & Co. He was made a partner in 1999 and later went on to become a Director at Port Jackson Partners. For many years Angus was recognised as a leading Australian and international management consultant.
During Angus’s consulting career – where he specialised in the resources, agriculture, energy and infrastructure sectors – he was a strategy and business adviser to a number of global and Australian companies and public sector organisations. Angus has also founded, advised or invested in a number of small, fast growing start-up businesses, mostly in the agriculture sector.