• Michael Sheridan

    • B.Ec, LL.M., F Fin


      Michael Sheridan replaced Brent Emmett as Chief Executive Officer and as a Director of the Company with effect on 1 July 2018.  


      Michael has been Horizon Oil’s Chief Financial Officer and Company Secretary since 2003.  He has been responsible for the Company’s financial, commercial and legal affairs. Prior to joining Horizon Oil, Michael held positions with international resource companies including Ampolex Limited, RGC Limited and Minera Alumbrera Limited in commercial and financial management areas. 


      Michael has been an integral member of Horizon Oil’s executive management team, along with Brent Emmett and Alan Fernie, and this will ensure continuity as Horizon Oil moves to the next stage of its growth.   Michael’s qualifications includes a Bachelor of Economics, Bachelor of Laws and Master of Laws and a Graduate Diploma in Applied Finance and Investment.


      Member of Risk Management and Disclosure Committees.


      See Michael’s full professional profile

Non-Executive Directors

  • Michael Harding




      Mr Michael Harding has been appointed on 28 November 2018 as an independent non-executive director and Chairman of Horizon Oil Limited on the retirement of Mr John Humphrey.


      Mr Harding brings considerable oil and gas experience to the board with over 25 years of international experience with British Petroleum (BP) in exploration, production and business management. He has held management positions around the world with BP, particularly associated with gas strategy, business performance, human resource management and governance in the Asia Pacific region. He was responsible for significant upstream businesses notably in PNG, Australia, Azerbaijan and the UK.


      Mr Harding is presently the Chairman of the Lynas Corporation Limited and Downer EDI Limited and a non-executive director of Cleanaway Waste Management Limited. He is a former Chairman of ROC Oil Limited, Clough Limited and ARC Energy Limited. He is a former non-executive director of Santos Limited.


      Chairman of Board and Chairman of Remuneration, Nomination and Disclosure Committees.  Member of Audit Committee.

  • Gerrit J de Nys

    • B.Tech, FIEAust, FAICD, CPEng


      Director for 10 years.   Over 44 years’ experience in civil engineering, construction, oil field contracting and natural resource investment management.   Non-executive director of IMC Pan Asia Alliance Group subsidiaries (a substantial shareholder of Horizon Oil Limited).


      Former non-executive Director of SOCAM Development Limited.


      Member of Risk Management and Remuneration and Nomination Committees.

  • Sandra Birkensleigh

    • BCom, ICAA, GAICD

      Director for 2 years.  Extensive experience in financial services and risk management, compliance and corporate governance. 24 years at PricewaterhouseCoopers (PwC) where she was formerly a Global Lead for Governance Risk & Compliance; a National Lead Partner Risk and Controls Solutions and a Service Team Leader for Performance Improvement.  Non-executive director of Auswide Bank Limited, MLC Limited, 7-11 Holdings and its subsidiaries, National Disability Insurance Agency and the Sunshine Coast Children’s Therapy Centre, an  independent member of the audit committee of the Reserve Bank of Australia, a member of the  Council of University of the Sunshine Coast and Chair of its Audit and Risk Committee and Chair of the Audit and Risk committee of the Public Trustee of Queensland.


      Former director of Plum Financial Services Limited.


      Chairman of Audit Committee; member of Risk Management and Remuneration and Nomination Committees

  • Greg Bittar

    • BEc., LL.B., (Hons) M.Sc., (LBS)

      Mr Bittar has been appointed as non-executive director on 6 March 2017.


      Mr Bittar has extensive experience in public and private markets mergers and acquisitions, capital markets and strategic advisory assignments across a range of sectors including general industrials, metals and mining, mining services and energy.  He is currently Chairman of Millennium Minerals Limited and Trek Metals Limited and a non-executive director of ECM Limited.


  • Bruno Lorenzon (Alternate Director)

    • Mr Bruno Lorenzon has been appointed as Mr Greg Bittar’s alternate on 15 March 2017.

      Mr Lorenzon is Head, Group Corporate Finance for the IMC Group and has more than 15 years’ experience in investments, strategy and corporate finance in the resources sector both in Australia and overseas. He has worked for the IMC Group for the past nine years and previously worked for Vale in Brazil and Rio Tinto in Australia in roles encompassing strategic planning, M&A and business development.  Mr Lorenzon has a Bachelor of Civil Engineering, MBA and is a CFA chartholder. Mr Lorenzon is also an alternate director representing the IMC Group on the Board of Millennium Minerals Ltd.

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