# We exist to protect people and planet.

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.

## our team & Culture

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

## Our history

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.

## We are employee-owned,  independent and collaborative.

Why us

## We exist to protect people and planet by making the ground beneath every project certain.

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.

## Ground truth. Clear advice

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

## our team & Culture

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

## Let’s talk

Contact us to discuss how we can support your project.

Let’s Talk