Our Company

We are Professional Geoscientists and Engineers committed to providing effective solutions for our clients.

Our approach to quality ensures our clients are informed about in-ground risks and are better placed to benefit from opportunities throughout the project lifecycle.

We are based in Sydney, Brisbane and Canberra and service surrounding regions.


D&N strives for technical excellence by utilising a sustainable investigation and design approach, which is deeply rooted in our passion for creative science and engineering. We put our clients interests first and focus on developing innovative solutions to raise the bar.


To be a leading geo-environmental consultancy, renowned for developing collaborative and effective solutions.


Integrity, Efficiency, Safety, Service Mindset, Empathy, Technical Expertise & Environmental Sustainability.

Our Leaders

Dan Butterworth

Company Director

Dan is responsible for the strategic growth, development and leadership of D&N. He works collaboratively with all our suppliers, staff and strategic partners to identify and effectively develop opportunities.

Dan is a Registered Professional Geoscientist with over 17 years of professional experience and a proven track record of working with and directing multi-disciplinary teams having spent much of his career working in Australia and overseas.

Liam Crosby

Operations Manager

Liam is responsible for supporting strategic growth through implementation and development of business systems and processes. His role includes continual improvement of project delivery with a strong focus on staff development and client satisfaction.

Liam has spent a large part of his career servicing our key clients and managing large multi-disciplinary teams in the delivery of complex technical projects. Liam’s strong appreciation of key client risks and an in-depth understanding of delivery requirements supports D&N’s vision to be a leading geo-environmental consultancy, renowned for developing collaborative and effective solutions.

Rian Vleggaar

Technical Director - Geotechnics

Rian is responsible for the technical growth, development and leadership of D&N. He provides staff and strategic partners innovative, technical direction across all facets of project delivery.

Rian has over 17 years of broad-based geotechnical investigation and design experience developed across a broad range of sectors. His key strengths reside in geotechnical data interpretation and design development. During his time at D&N, he has specialised in temporary and permanent design solutions for pavements (heavy duty, road, rail), retention structures and foundations.

Nick Davison

Technical Director - Environments

Nick is responsible for the delivery and development of D&N’s environmental capabilities. He provides experienced and technically accurate advice, to ensure our strategic partners understand their in-ground environmental risks and facilitating the implementation of effective workable solutions.

Nick has over 16 years of environmental investigation and site remediation experience, delivering projects across a broad range of sectors. His background and strong understanding of environmental guidelines and obligations assists our clients in making informed decisions of in-ground environmental risks.

Our Clients

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