Broomhead was appointed managing director and Chief Executive of Orica Limited in 2001; a position he held until September 2005.
[4][5] In the late 2000s, he acted as Chairman of Asciano Limited (2009-2016) and a Director of Coates Group Holdings Pty.
Broomhead joined BHP Billiton as a non-executive director in 2010, and was appointed chairman of the company's sustainability committee in 2017.
[7][8] Broomhead was appointed Director of the Walter and Eliza Hall Institute of Medical Research in July 2014, Chairman of the Australia China One Belt One Road Advisory Board in August 2016,[7] and is a council member of Opportunity International Australia.
[9] Broomhead made a $3 million philanthropic contribution to the University of Queensland to establish its first Chair of Finance.