Ō MĀTOU TĀNGATA

OUR PEOPLE

Grant Aitken

Since joining BTW in 2003, Grant has played a key role in the company’s growth and evolution, becoming a director in 2008 and Managing Director in 2016.

He is passionate about building high-performing teams, supporting clients, and creating a business that delivers lasting value for its people, communities, and future generations.

With extensive experience in leadership, governance, and strategic development, Grant has helped guide BTW through periods of significant change while remaining focused on the values, culture, and relationships that have been central to the company’s success for more than 50 years. Today, his focus is on leading BTW into its next chapter, strengthening its foundations while embracing new opportunities for innovation, and collaboration. 

A proud Taranaki local, Grant enjoys spending time with family, surfing, snowboarding, and making the most of New Zealand’s outdoors.

Cam Twigley

Cam is an experienced environmental planner with more than 25 years’ experience delivering planning, consenting and environmental solutions across a wide range of projects. As a practising Independent Hearings Commissioner, he brings valuable insight into planning processes, regulatory requirements and decision-making.

Cam specialises in project managing complex consenting processes, providing strategic planning and policy advice, and helping clients meet their ongoing environmental responsibilities. His focus is on achieving practical outcomes that enable projects to move forward while delivering sustainable environmental results.

As Chair of BTW’s Green Team, Cam leads the implementation of the company’s Environmental Management System and supports continuous environmental improvement across the business.

Outside of work, Cam serves in voluntary governance roles and he also enjoys fishing, surfing and socialising with family and friends.

Ian Steele

Ian Steele is BTW’s Director of Engineering and a Chartered Professional Engineer (CPEng) with extensive experience in civil engineering, infrastructure delivery, and engineering leadership. He leads BTW’s engineering team, ensuring clients receive practical, fit-for-purpose solutions that deliver value across projects of all sizes.

Ian’s expertise includes civil design, land transport, infrastructure asset management, contract management, and land development. He is passionate about developing capable teams and fostering a collaborative, accountable culture that empowers people to deliver their best work.

Since joining BTW in 2011 and becoming a Director in 2013, Ian has helped shape the company’s growth and reputation for trusted engineering advice. A proud Taranaki local, he brings extensive experience from projects across New Zealand and Australia to the clients and communities BTW serves.

Mathew Dickey

Mathew is a Principal Civil and Three Waters Chartered Engineer. Mathew is based on Taranaki, but works nationwide and has a passion for the water industry, specialising in Three Waters infrastructure assessment and design.

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.

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

Keith Preston

Keith is a Director at BTW and Technical Director of Survey and Spatial, bringing extensive experience across the region’s survey and geospatial services.

His expertise covers aerial and terrestrial surveying, 3D laser scanning, land development, engineering surveying, and project management. Beyond project delivery, Keith is focused on developing the capability of his team, while remaining the primary point of contact for a wide range of clients across a diverse project portfolio.

He has a strong passion for bespoke digital solutions, and is increasingly weaving automation, robotics, and AI into how the team approaches survey and geospatial work. Keith keeps pace with advances in surveying technology and equipment, ensuring projects are delivered accurately and efficiently.

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 Information Systems Manager, responsible for the technology that BTW and its clients rely on every day. His role is a governance one, keeping eyes and ears on new technology, cyber security, artificial intelligence and data management, so the business adopts the right tools for the right reasons and client information stays protected.

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

Trevor has been part of the BTW team for 15 years and is a company shareholder.

Based in New Plymouth, Trevor enjoys kitesurfing, mountain biking and golf.

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 holds a Bachelor of Science (Physical Geography and Environmental Science) from Massey University (1996). Dave is a Certified Environmental Practitioner (CEnvP) EIANZ Certification No.870 and is a recognised Suitably Qualified and Experienced Practitioner (SQEP) for contaminated land investigations. Dave has also completed the BOHS IP404 Air Monitoring, Clearance and Reoccupation following the Removal of Asbestos.

Dave has more than 20 years of environmental experience throughout New Zealand. With Dave’s experience in contaminated land investigations, he has significant experience with asbestos in soil and associated buildings that have contained asbestos. Dave has represented clients in the Environment Court for hydrocarbon remediation and has experience in managing significant environmental projects for both local and national clients.

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.

Wasi Shirwali

Wasi is BTW’s Hamilton Engineering Team Leader, bringing over 16 years of civil engineering experience and a strong track record in delivering infrastructure projects across the Waikato, Auckland, and Manawatu regions. Holding a Bachelor of Engineering, he provides practical and innovative solutions tailored to client needs. His expertise includes three waters infrastructure, reticulation design, construction monitoring, and network operation, maintenance and asset planning. With experience across both local government and consulting environments, Wasi combines technical excellence with effective project leadership.

Over his 7 years with BTW, Wasi has played a key role in delivering successful projects, building strong client relationships, and leading high-performing teams. His collaborative approach and commitment to quality make him a trusted partner for clients and stakeholders.

Outside of work, Wasi enjoys exploring the outdoors and spending time with his family.

Carwyn May

Carwyn brings extensive surveying experience and strong local knowledge of Taupō and the wider Central North Island. His experience spans land development, subdivision and construction surveying, with a practical understanding of the local landscape and the opportunities and challenges involved in developing land.

Highly client-focused, driven and committed, Carwyn takes the time to understand what clients want to achieve and provides clear, practical advice to help move projects forward. As BTW’s Taupō Survey Team Leader, he combines strong local relationships with the wider expertise and resources of BTW’s multidisciplinary team.

Outside work, Carwyn is an avid cyclist and accomplished mountain biker.

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.

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.

Taryn Martin

Taryn is a Senior Licensed Cadastral Surveyor.

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.

Chris Twaddle

Chris is a Chartered Professional Engineer with more than 25 years’ structural engineering experience across projects throughout New Zealand. He brings extensive expertise in structural and seismic design, assessment and strengthening, with considerable experience investigating existing structures, interpreting their likely behaviour and advising owners on risk, strengthening and reuse.

Based in Hamilton, Chris provides senior technical leadership across BTW’s structural engineering work, supporting clients from early investigation and assessment through design and delivery. His considered, pragmatic approach combines strong technical capability with a focus on understanding project challenges and delivering practical, buildable and fit-for-purpose solutions.

Greg Larkin

Greg holds a BSc in Ecology from Lincoln University and a Master’s in Environmental Science (Distinction) from the University of Otago.  Greg brings over 19 years of experience in resource and water management, with a strong focus on aquatic and terrestrial ecology, surface water and stormwater quality. 

His expertise spans ecological impact assessments (EcIA), wetland delineation and environmental sampling across diverse ecosystems in Aotearoa New Zealand. He has extensive experience preparing and peer review of technical assessments to support resource consent applications, including land use, subdivision and discharge consents. Greg is adept at developing mitigation strategies from early design phases through to construction oversight and implementation of consent monitoring programmes.  His work includes leading biodiversity management and restoration programmes, designing and implementing ecological monitoring programmes.

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.

Angina Lal

Jodie Hurley

Russell Harrison