Executive Management

Mr David Cavanagh
Chief Financial Officer
Appointed 4 December 2017

David graduated with a Bachelor of Commerce (Finance and Accounting) and biochemistry from the University of Queensland in 2004 and went on to become a Chartered Accountant with the Institute of Chartered Accountants two years later. He completed a CFO mentoring program with Australia’s Financial Executive Institute under the mentorship of BankWest’s CFO in 2015.

David soon emerged as a talented leader in Australia’s banking and finance industries; serving as the Manager, Corporate Advisory and Restructuring with PWC, Commercial Manager at Macquarie Bank and a Senior Analyst at Deloitte.

In 2010, David steered his career towards the marine logistics industry and spent seven years working within the Toll Group of companies. He held the position of General Manager, Finance and Commercial for Toll Resources and Government Logistics, a company with $1.2b in revenue per annum. Before this he spent time as the Manager of Finance and Commercial for Toll Energy and Marine Logistics, and for Toll Remote Logistics Pty Ltd.

In December 2017, David was appointed as Chief Financial Officer of MMA Offshore. David’s strong background in marine logistics coupled with his financial and commercial acumen, provides MMA with unique financial leadership.

Mr Tim Muirhead
Executive General Manager - Legal / Company Secretary
Appointed 10 January 2022

Tim is an Australian qualified lawyer with over 15 years’ experience in the provision of corporate and commercial advice.

Tim joined the MMA Offshore legal team in November 2009 prior to being appointed as Company Secretary and General Manager - Legal in January 2021. Prior to joining MMA Tim commenced his career as a corporate lawyer at a leading Australian law firm Clayton Utz, where he gained exposure to a broad range of corporate and commercial transactions.

Tim has also been Senior Legal Counsel at ASX listed Orica Limited, where he was responsible for providing legal and governance advice to Orica’s businesses in Asia and the Middle East. Tim holds a Bachelor of Science and Bachelor of Law (with distinction) from the University of Western Australia and a Graduate Diploma of Applied Corporate Governance and Risk Management from the Governance Institute of Australia.


Ms Liz Buckey
Executive General Manager - Corporate Development
Appointed July 2010

Liz joined MMA in July 2010 and was appointed General Manager - Corporate Development in November 2012. Liz's areas of responsibility include Corporate Strategy, Mergers and Acquisitions, Corporate Affairs and Risk Management. Previously, Liz was an Associate Director at Azure Capital where she worked on mergers and acquisitions, capital raisings and IPOs across a range of industries. Liz was also Chief Financial Officer of Azure Capital between 2004 and 2007. Prior to Azure, Liz was Financial Controller of Poynton and Partners and an Associate in their management consulting and corporate advisory practice. She also spent a number of years at PricewaterhouseCoopers in their Enterprise Solutions Group. Liz has a Bachelor of Commerce from University College Dublin, is a qualified Chartered Accountant, a Fellow of the Financial Services Institute of Australasia (FINSIA) and has completed the Corporate and Financial Strategy Executive Program at INSEAD in France.

Mr Stuart Edgar
Executive General Manager - Vessel Services
Appointed 12 October 2020

Stuart joined MMA in 2010 as part of the business development team, and was appointed to the role of Business Development Manager Australasia in 2016. Prior to joining the organisation, Stuart held BD roles at Toll Energy Logistics, Technip Oceania and CHC Helicopter. He has extensive experience in both onshore and offshore oil and gas logistics operations.

In November 2018, he was appointed to the position of Executive General Manager - Project Logistics. In this position he has responsibility for MMA's onshore facilities as well as leading MMA’s support to global oil and gas projects. In October 2020, Stuart was appointed to the position of Executive General Manager Vessel Services and oversees MMA's fleet of vessels.

Mr Tom Radic
Executive General Manager - Subsea Services
Appointed 03 February 2020

Tom began his professional career in subsea engineering and project management with Clough Oil and Gas in 2003, where he gained experience in the execution of offshore oil and gas projects in the SE Asia and Australia region. In 2006, Tom joined Subsea 7, where he spent 13 years in project management and commercial roles, contributing to both new business acquisition and the delivery of major global projects. His final three years with Subsea 7 also included leading the execution of a new capital development for the organisation, where he gained exposure to the strategic elements of the organisation. Tom subsequently took up a role with ConocoPhillips, gaining operator experience, before joining MMA Offshore in 2020 as the Executive General Manager – Subsea Services.

During his career, Tom has gained global experience having worked in Australia, SE Asia, India, Europe and the UK and Africa, and executed projects for a number of the world’s highest profile oil and gas operators. Tom graduated from the University of Western Australia with a Bachelor of Engineering (Civil, 1st Class Honours) and a Bachelor of Commerce (General Management and Human Resources Management) in 2002.

Ms Debbi Garreffa
Executive General Manager - Risk
Appointed 24 January 2022

Debbi began her career in Compliance and HSE management with the Water Corporation in Karratha and worked extensively within the North West Region of the Water Corporation for several years prior to joining MMA Offshore.

During her 19 years at MMA, Debbi has held a number of management and senior management roles across operations, commercial, compliance, project management and HSE. This has involved vessel new-build completions, mobilisations, acquisition integrations, commercial contract and project management and management of all MMA license to operate compliance regimes.

Since 2015, Debbi has been responsible for Corporate and Operational Compliance across our Vessel Services and Subsea Services business units. In January 2022, Debbi was appointed into the newly created position of Executive General Manager – Risk. Debbi’s portfolio includes HSE, Corporate Risk, Compliance and Internal and External audit functions.

Debbi has a Master in Business Administration and is a member of the International Maritime Contractors Association (IMCA) Asia Pacific Regional Committee.

Mr Peter Bengtsson
Executive General Manager - Project Logistics
Appointed 01 February 2023

Peter started his professional career at sea working predominantly on tankers, but also cruise and sailing vessels prior to coming ashore.

Over the last 20 years Peter has held various positions in Shipping and Logistics companies all around the world including New Zealand, Australia, Singapore, Lagos and Dubai. These roles have included a range of activities, from Liner Shipping, Project Cargoes, Agency Services, 3rd Party Logistics, Major Project Logistics to Offshore Oil and Gas Services.

Since arriving in Australia Peter has, among other responsibilities, served as CEO of OMSA and Managing Director of SIEM OFFSHORE Australia Pty Ltd. Peter holds a bachelor’s degree from Chalmers University of Technology in Sweden and completed the Advanced Management Program at INSEAD in 2009.