Our People

Grant Aitken

Grant is our Managing Director and leads BTW with passion and pride. His experience in the industry and business is key, and his knowledge in managing high performing teams, project management, financial planning and governance is paramount to BTW’s success. Having joined BTW in 2003, Grant became a company Director in 2008 and Managing Director in 2016.

A Taranaki local through and through, and a family and community man, Grant enjoys the great outdoors and is a keen surfer, snowboarder and gardener.

Grant’s door is always open, and he would be happy to talk to you about how BTW can make your project a success.

Graeme Johnston

Graeme is a BTW Company Director, supporting the Survey and Energy Teams. His principal focus is on up-stream Energy clients, overseeing works related to wellsite construction and pipeline installation, with attention to quality management, ensuring survey accuracy and compliance with central and local government regulations. He has a key understanding of the flexibility and responsiveness required to deliver projects within the Energy sector.

Graeme joined BTW as an Engineering Surveyor in 2007 and completed an extramural MBA in 2010. He became Manager of the Energy Team in 2011 and a Director of BTW in 2013.

Born and bred in Otago, New Zealand, Graeme worked in the Middle East, Europe and South East Asia before coming to Taranaki in 2007 with his English wife and their two Hong Kong-born sons. When not in the office he has a lifestyle block in Kaitake, Oakura to keep under control, or can be found hiking the trails up and around Mount Taranaki.

Cam Twigley

Cam has been a practising environmental planner for 19 years and is an accredited Independent Hearings Commissioner. He is confident and skilled at project managing the consenting phase of major projects, advising on policy planning matters and assisting his clients with ongoing environmental responsibilities. Cam aims to make projects happen for his clients while achieving sustainable outcomes.

Passionate about giving back to the community, Cam is a volunteer on the Board of the Taranaki Chamber of Commerce, Te Kura Waenga o Ngāmotu Central School Board of Trustees and the Taranaki Branch of the Resource Management Law Association.

In his spare time, he loves fishing and surfing and socialising with family and friends.

Give Cam a call for the best possible planning and environmental advice.

Ian Steele

BTW’s Director of Engineering, Ian Steele is a practicing Principal (CPEng) Civil Engineer. He leads our civil and structural engineering teams with a focus on providing fit-for-purpose designs – whether the job be large or small.

Ian has been in engineering management most of his career and has a strong emphasis on ensuring the team is well prepared and trained, meaning that your project gets the right expertise, first time. As an engineer, Ian’s strong experience is in land development and transport – including earthworks/geotechnical, stormwater, traffic/transport, roads and contract management.

Ian joined BTW in 2011 and became a BTW Director in 2013. Having grown up in Taranaki, he returned to the region after some time living further afield and has experience working on projects throughout New Zealand and Australia.

A keen fisherman, boatie and father of two — Ian is currently the President of the New Plymouth Sportfishing and Underwater Club, and Vice President of the New Zealand Sportfishing Council.

Ian is always ready for a discussion on how to make your project a success, even if that means thinking laterally about how it can be achieved.

Mathew Dickey

Mathew is a Civil and Structural Chartered Engineer and BTW’s youngest Director. He has been part of the BTW team since a young age, starting as a high-school labourer before progressing into a full-time engineer after completing his Engineering Studies at the University of Auckland.

Mathew is based in the New Plymouth office and has a passion for the water industry, specialising in Three Waters civil design and modelling. 

Outside of work, Mathew is a keen equestrian enthusiast and enjoys the mountain and sea.

Keith Preston

Keith is a dedicated and passionate leader at BTW, serving as a company Director and Leader of our Geospatial and Energy team. With unwavering commitment, he brings his wealth of experience to the forefront.

His expertise spans a wide spectrum of surveying services, including both aerial and terrestrial surveying, 3D Laser scanning, Building Information Modelling (BIM), Land Development, engineering surveying, and project management. Keith takes on the role of the primary point of contact for numerous clients, offering comprehensive guidance while actively contributing to a diverse array of projects.

Keith is also at the forefront of technological advancements in the surveying field, ensuring that he remains updated with the latest equipment, thus guaranteeing the precise and efficient execution of all projects.

Hailing from Taranaki, Keith became a valued member of BTW in 2015 as a Licensed Cadastral Surveyor, and shareholder in 2019. Beyond his professional life, he enjoys the challenge of multisport events and cherishes moments in the great outdoors with family and friends.

Roy Weaver

Having a Civil and Structural Engineering background, Roy is experienced in managing large projects for government and private owners in NZ and offshore.  He holds an MBA with Distinction, enjoys mentoring the next generation of young leaders and finding wins in those sticky situations that arise in business from time to time.

Roy joined BTW in 2015 after 19 years as a port CEO and various associated board roles. His focus is on business planning and development, including BTW’s establishment of a Waikato office in Hamilton.

Originally from the Wairarapa, he has fond memories of first competing with the Taranaki U14 representative football side in New Plymouth. Roy and his partner Annette enjoy cycle touring, hiking and activities with their seven grandchildren on three different continents.

Roy is a Chartered Director and brings both his governance and leadership experience to BTW. He enjoys working with the fast-paced and innovative group at BTW — a group that makes it happen for clients. 

Kathryn Barrett

Kathryn joined BTW in 2001 and became a Licensed Cadastral Surveyor in 2005. Kathryn specialises in legal boundary surveys (subdivisions, easements, and road legalisation) and management of land development projects.  Kathryn uses technology and works closely with developers, architects, engineers, construction contractors, service authorities and government agencies to ensure projects are carried out accurately and efficiently.

Trevor Masters

Trevor is our IT Manager and leads our software development at BTW.

He has broad computing experience including spatial data systems, databases and software engineering, which enables him to see the bigger picture when developing solutions.

He has worked for BTW several different times in as many roles, starting out as a survey labourer in 1981 before becoming a software engineer, developing and supporting offshore navigation and data acquisition solutions.

Born and raised in New Plymouth, Trevor enjoys kitesurfing, brewing beer and running.

Taryn Martin

Taryn is a Licensed Cadastral Surveyor/ Survey Team Leader for our Hamilton office.

Taryn works with all internal and external stakeholders to deliver a land development or subdivision project on time and on budget.  Technology aids this process and is embraced on these projects to give clear and concise deliverables in an efficient and accurate manner. Taryn has experience in a broad range of surveying services, including close liaison with developers, architects, engineers, construction contractors, service authorities and government agencies to ensure reliable transfer of survey information.

Sean Husband

Sean is a Chartered Professional Engineer with over 10 years’ experience in land development. Sean specialises in the design of civil infrastructure and stormwater management systems, and has a strong background in project management, contract administration and construction monitoring.

Dave Bolger

Dave is BTW’s Environment Manager and heads a team of scientists with focus and integrity. His experience is nationwide, and his knowledge on environmental issues and regulations provides clients and regulators with confidence and trust.

Dave has specialist skills in land contamination and has managed large-scale environmental projects. He joined BTW at the start of 2013 as a scientist and in 2018, Dave became the Team Leader of the Environment Team, before moving into his current position as Manager of the Environment team in June 2019.

Born in Taranaki with a real passion for the natural environment and adventure, Dave is often off on adventures with his family. These include the likes of rock climbing, mountaineering, surfing and trail walking.

Dave always provides time to listen, and then offers solutions and options to guide decision making for your project.

Wasi Shirwali

Wasi is BTW’s Hamilton Engineering Team Leader, bringing over a decade of civil engineering experience to our team. Holding a Bachelor of Engineering, Wasi has worked extensively across the Waikato, Auckland, and Manawatu regions.

His expertise spans three waters, reticulation infrastructure design, construction monitoring, and network operation and maintenance planning. Wasi’s background includes significant roles with local authorities and engineering consultancies, giving him a strong foundation in project management.

Wasi has been a valued member of BTW for 5 years, and his dedication and expertise have been instrumental in our projects. When he’s not leading our engineering team, you can find Wasi exploring the beautiful outdoors of New Zealand.

Trudy Brewer

Trudy is our Finance & Administration Manager, a.k.a. ‘The Sheriff’. Trudy’s knowledge of everything BTW is paramount to the day-to-day running of the BTW ship.  Trudy is a company stalwart who joined BTW in 1996 as the administration assistant, but over time her job morphed into higher level work with on-the-job training and development.

Taranaki born and bred, Trudy loves to spend spare time with family and friends, and to travel overseas.

Trudy will always greet clients with a happy face or voice at the end of the phone, and is always willing to go the extra mile for clients and the BTW team.

Nicholas Cavaye

Nicholas joined as our Quality, Safety and Culture Manager (QSCM) in October 2023. He’s worked in HSEQ operational and leadership roles in Aotearoa New Zealand and globally for 25 years and is accountable for ensuring BTW meets internationally recognised quality management and safety standards. He is deeply committed to building and sustaining BTW’s culture.

He believes that company culture connects us and defines how we show up – whether that’s with each other, our clients, suppliers, regulatory authorities, industry partners or the communities we work with.
Our culture is how we interact, the values that drive us, and what we believe in. Anyone we work with should immediately be able to feel it, and it should give them certainty about who we are and how we will deliver. https://www.btw.nz/about/btw-values-culture-purpose/

Aaron Edwards

Aaron is a seasoned Principal Planner at BTW, bringing over a decade of resource management expertise from all corners of New Zealand. With a solid background in preparing and processing consent applications, project management, policy analysis, and stakeholder engagement, Aaron’s skill set is both broad and deep.

His experience spans large-scale infrastructure, energy, and oil and gas projects, including notable secondments with NZTA and First Gas. Aaron’s dedication and proficiency have earned him full membership with the New Zealand Planning Institute (MNZPI).

Having been with BTW for just over 7 years, Aaron is not only a valuable part of our team but also a passionate surfer who loves to catch waves in his free time. His enthusiasm for the ocean reflects his dynamic and energetic approach to his work.

Remalia Wallis

Remalia, based in Hamilton, is the Team Leader for the Waikato Environment Team. She works closely with Dave Bolger and the New Plymouth team of scientists, as well as the engineering teams to provide a collaborative environment within BTW. 

Remalia has 15 years’ experience as an environmental consultant and project manager in New Zealand and Australia, with a focus on water resources. Her multi-disciplinary experience spans water supply and wastewater disposal for private and council clients, construction dewatering, landfills, quarries and mines, contaminated land, and the energy industry.

Outside of work, Remalia can be found on her bike riding one of the many trails in the Waikato, stopping at new cafes along the way.

Greg Larkin

Greg leads BTW’s Ecology Team, bringing over 15 years of expertise in resource and water management, with a special focus on aquatic and terrestrial ecology, as well as surface and stormwater quality. His extensive experience includes preparing technical assessments for resource consent applications and developing effective mitigation measures from design through to construction and consent monitoring.

Having dedicated over a decade to BTW, Greg’s commitment and deep knowledge are vital to our projects. Born and raised in Taranaki, Greg is a local through and through. Outside of work, he’s an avid surfer, climber, and skier, always ready to explore the great outdoors.