He was the member of the Australian House of Representatives seat of O'Connor for the National Party of Western Australia from the 2010 federal election until August 2013.
Crook served as chairman of the Western Division of the Royal Flying Doctor Service for 10 years until his retirement in 2009.
Crook said he had been disappointed by media coverage of the hung parliament, which counted him as part of the Coalition along with National MPs from east of the Nullarbor.
[14][15] Crook at times did vote for federal Labor government policies in parliament, contrary to the official position of the National Party of Australia.
[18] On 9 April 2013 Crook announced he planned to retire from politics at the forthcoming election citing stress resulting from long-distance travel and separation from his family.
Following the 2017 State Election in which Crook was unsuccessful he was appointed the chief executive officer (CEO) of the Kalgoorlie-Boulder Racing Club Inc (KBRC).