Our Team

RDA consulting has a well experienced team of professionals. The three Directors of the firm are Leigh Mathieson, Ross Cottier and Tony Hammington.

RDA consulting has experienced geotechnical engineers, engineering geologists, environmentalist and field staff and administrative personnel.

Your RDA Consulting Team

Stephen Black

Stephen Black

Operations Manager

Oamaru Office

P: 027 248 8475
E: [email protected]

Mark Adam

Mark Adam

Engineering Geologist - BSc (Geol), Professional Masters of Engineering Geology (PMEG), DipGrad Computer Science

Invercargill Office

P: 027 284 9833
E: [email protected]

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Mark joined RDA in January 2021. Originally from Milton, Mark started his career as a Fire Fighter in the RNZAF, before an interest in earth science led to studying a Bachelor of Science in Geology at the University of Otago. Afterwards, Mark went to work in Western Australia as a Mineral Exploration Geologist for several years.

On return to New Zealand, he completed a Computer Science Diploma for Graduates. He has worked as a contract geologist and a quarry worker, obtaining a B-Grade quarry manager’s certificate.

Looking to get back to a more geology-based role and acquiring an interest in engineering geology he completed his Master of Professional Engineering Geology post graduate studies at the University Canterbury in 2020.

Mark Simpson

Mark Simpson

Civil Engineer NZDE (Civil)

Invercargill Office

P: 027 642 1689
E: [email protected]

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Marked joined RDA in June 2022. After completing his Diploma in Civil Engineering at Otago Polytechnic he worked for a construction company and an engineering consultancy before heading over to Perth for a couple of years working for the local water authority.

“Coming back from Australia and settling in Invercargill I have worked with both the Invercargill City and Southland District Councils undertaking infrastructure design and project management work, mainly around Three Waters, which included the first stage of the Branxholme water supply mains duplication.

For the past 6 years I have been employed as a contracts manager for a local construction company as site manager for the installation of underground services on a large dairy plant build as well as tendering and managing numerous civil infrastructure works.

I look forward to bringing my knowledge and experience to RDA to assist clients in achieving their desired outcomes.”

Kathy Golds

Kathy Golds

Administration Manager - NZ Dip. Bus

Invercargill Office

P: 027 642 1689
E: [email protected]

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Kathy joined RDA in May 2022 after deciding to leave Auckland to be closer to her Southland-based daughter and her family. Kathy has worked in accounting based roles for the past 3 decades (a mixture of CA office and private training provider) and enjoys the variety of work that comes with running a small business.

In her spare time Kathy is a member of GirlGuidingNZ and enjoys reading, gardening and handcrafts.

Sol Kim

Sol Kim

Senior Environmental Planning Consultant - Bachelor of Environmental Management

Invercargill Office

P: 027 530 4470
E: [email protected]

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Sol joined RDA Consulting in April 2024 as a Senior Environmental Planning Consultant.

Having emigrated from South Korea to New Zealand with his family at a young age, he grew up in the Waikato and Canterbury and later completed a Bachelor of Science in Environmental Management at the Southern Institute of Technology in Invercargill.

Prior to joining RDA Consulting, Sol worked at Environment Southland as a Consents Officer for nearly five years.

During this time, he gained experience in navigating the regional and national planning frameworks to assess applications for resource consents, while achieving practical solutions that are beneficial for both the applicants and the environment.

“I look forward to using my knowledge and experience to secure the necessary resource consents for my clients and address any related environmental matters”.

In his spare time, Sol enjoys keeping active and spending time with his friends and family.

Jim Tawaketini

Jim Tawaketini

Civil Engineer - NZDE (Civil), Bachelor of Engineering Technology (Civil)

Oamaru Office

P: 027 278 4030
E: [email protected]

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Jim joined RDA in September 2023 as a Civil Engineer. Jim, or JT as he is also known, completed his NZ Diploma in Engineering (Civil) at Unitec in Auckland. He then transferred down to Otago Polytechnic where he did another year to achieve his Bachelor of Engineering Technology (Civil).

JT’s working career started as a graduate technician where he undertook QA for various roading contracts, working his way up to Design Engineer where his focus was on roading projects which varied from retaining walls, new road layouts to standard “road rehab” projects. JT’s next role as a Contract Manager for a Contracting company (who held the local council’s roading maintenance contract) was to run the day-to-day activities of the siteworks crew. These roles have helped JT gain a lot of knowledge and experience which he is looking forward to bringing to the RDA team.

“I look forward to being part of the team and won’t be shying away from any challenges that may come my way in this new role.

Brad Trebilcock

Brad Trebilcock

Environmental Consultant - Bachelor of Environmental Management

Mosgiel Office

P: 027 292 5732
E: [email protected]

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Brad joined RDA in August 2023. Originally from Westport is family moved to Mosgiel when he was little and he’s lived on a sheep and beef farm ever since.

Whilst completing a Bachelor of Environmental Management at Lincoln University he worked as an artificial breeding technician for Livestock Improvement for 4 years in Canterbury and South Otago. Since graduating, he has worked as a Consents Planner with the Otago Regional Council processing Consent Application for stakeholders across the Otago Region.

In his spare time he enjoys being out on the farm, tramping, or going for a run.

Abdul Al Waaili

Abdul Al Waaili

Graduate Engineering Geologist - Bachelor of Science (Geology)

Invercargill Office

P: 027 293 3563
E: [email protected]

QUEENSTOWN
OFFICE

15 Gray Street
Frankton

OAMARU

OFFICE

19 Eden Street
Oamaru

INVERCARGILL
OFFICE
23 Forth Street
Invercargill

POSTAL

CORRESPONDENCE

PO Box 1711
Invercargill 9840