Federal Senator for Queensland (Feb 2014- present)  
State Treasurer, LNP Queensland (2009-13) 
Chair, LNP Candidate Review Committee (2010-13) 
Member, Candidate Review Committee (2008-13) 
Chair Rockhampton Branch, The Nationals 
Chair and Campaign Director, Rockhampton state electorate, The Nationals 
Police Officer, Queensland Police (1976-91) 
Managing Director, NewLands Group Holdings Pty Ltd (2008-2012)   
Managing Director, Jilbridge Pty Ltd (1991-2013)  
Rockhampton Morning Bulletin 
 Source: https://www.aph.gov.au/Senators_and_Members/Parliamentarian?MPID=247871 (Viewed 4/12/18).
 O’Sullivan replaced Barnaby Joyce in the Senate, after being cleared by Queensland’s crime and misconduct commission. Source: https://www.thesaturdaypaper.com.au/news/politics/2014/03/29/barry-osullivan-replaces-barnaby-joyce-the-senate/1396011600 (Viewed 5/12/18).
 Contracts include Origin Energy’s Australian Pacific LNG (APLNG) coal seam gas project. The company has obtained pre-qualifications for Queensland Gas Company (QGC), Arrow Energy, Queensland government and Northern Territory government work. Source: http://www.newlands.com.au/about-us.html (Viewed 4/12/18). O’Sullivan’s company lay the foundations for CSG-LNG entry across regional Queensland, including the main entrance to Wagners’ Wellcamp Airport. Source: https://www.michaelwest.com.au/the-great-gas-con-how-we-got-sucked-dry/ (Viewed 7/12/18). In August 2017 it was reported that Senator O’Sullivan’s family business (Newlands Group) had been awarded $25 million for a Queensland infrastructure project that was 80% funded by the Commonwealth government. Source: https://www.smh.com.au/politics/federal/government-senator-barry-osullivan-under-a-cloud-over-business-interests-20170817-gxypn8.html (Viewed (7/12/18).
 O’Sullivan founded Newlands Civil Construction Pty Ltd in September 2008, a few weeks after registering the merger of the Liberal and National parties in Queensland (July 2008). The merged LNP facilitated the entry of unconventional gas to LNG. https://www.michaelwest.com.au/investigation-barnabys-gas-bonanza-and-the-pervading-influence-of-the-gas-lobby/ O’Sullivan resigned as director in 2012 (prior to his Senate nomination), but retained a stake through Jilbridge (his commercial building and investment firm) and passed NewLands to his son, Barry O’Sullivan Jnr. Source: https://www.smh.com.au/politics/federal/government-senator-barry-osullivan-under-a-cloud-over-business-interests-20170817-gxypn8.html (Viewed 5/12/18). Senator O’Sullivan’s current register of interests (viewed 7/12/18) lists himself as beneficiary of various family trusts, including: The O’Sullivan Investment Trust; and Barry Colin O’Sullivan (Jnr) as the Annie O’Sullivan Family Trust. Senator O’Sullivan also nominates shareholdings in Jilbridge Pty Ltd, New Lands Group Pty Ltd, Newlands Civil Construction Pty Ltd, New Lands Group Holdings Pty Ltd and O’Sullivan & Sons Pty Ltd – among others. Source: https://www.aph.gov.au/Parliamentary_Business/Committees/Senate/Senators_Interests/CurrentRegister (Viewed 7/12/18).
 O’Sullivan established Jilbridge, a development and civil construction business based in Toowoomba, QLD. Source: http://barryosullivan.com.au/about/ (Viewed 4/12/18).