Core is a geotechnical and environmental consultancy, providing solutions across Queensland and Australia. We are practical, evidence-led and focused on outcomes. Clients value our calm approach, clear reporting, and advice that stands up to scrutiny.
Core is 100% employee-owned. Many team members are also shareholders, which keeps decision-making local and service standards high.
We are employee-owned, independent and collaborative. We listen first, then recommend the right path based on evidence, standards, and site realities. Our team lives where we work, and we take responsibility for the places our projects shape. We also support emerging talent through partnerships with local universities and graduate pathways.
Shareholders and Owners
Walter Mastenbroek
Director, Principal
Geotechnical Engineer
Josh Mitchell
Director, Principal
Environmental Consultant
Cameron Kay
Director, Principal
Environmental Consultant
Andrew Middleton
Associate, Senior
Principal Geotechnical Engineer
Brodie Hare
Associate, Senior
Geotechnical Engineer
Darryn Quinn
Associate, Principal
Geotechnical Engineer
Simon Maggiora
Associate, Principal
Geotechnical Engineer
Brett Garrett
Senior Principal
Remediation Engineer
Daniel O’Sullivan
Senior Environmental
Engineer
Justine Zoljian
Senior Environmental
Scientist
Samuel Rouse
Senior Environmental
Scientist
Micheal Rice
Environmental
Scientist
Thomas Sutton
Geotechnical Engineer
Mitchell Dakin
Geotechnical Engineer
Core’s roots go back to the 1980s, as the Sunshine Coast regional branch of a multi-national consulting firm.
Officially founded as an independent and employee-owned consultancy in 2015, Core continues a long local legacy of geotechnical and environmental work across South-East Queensland and beyond.
In 2022, we invested in growth with a purpose-built Sunshine Coast facility in Coolum Beach and a larger Brisbane base in Hemmant to support an expanding team and workload. In 2025, we expanded our Gold Coast operations to a new office in Coomera.
Why us
How
By pairing local experts with ISO-certified quality in the field, then translating findings into plain-English, actionable advice that clients can trust.
What
From site investigation to design and compliance, we turn ground data into reliable engineering solutions that keep projects moving first time.
Practical, evidence-led outcomes. Built on independence and integrity
Independent, employee-owned consultancy
100% employee-owned and independent since 2015
ISO-certified quality and environmental systems
ISO 9001 and ISO 14001 certified processes
Clear reporting that reduces risk
40+ specialists, 5000+ projects delivered
Advice that keeps projects moving
90% repeat-client rate, through reliability and trust
Contact us to discuss how we can support your project.
