Branch Coordinators (Auckland)
Mazen Al-Haidar
Mazen is a Geotechnical Engineer at Riley Consultants Ltd, after working as a Structural and Geotechnical Engineer in Christchurch. His experience includes slope stabilisation, forensic investigation, stability analysis, land development, coastal assessments, earthworks monitoring, foundation and retaining wall design, liquefaction assessments, and construction observations. He graduated from the University of Canterbury in 2020 after completing his
Bachelor of Civil Engineering (Honors). He also completed a Certificate in Commerce from the University of Canterbury in 2023.
Blair Matheson
Blair is a Chartered Geotechnical Engineer with over 14 years of experience across New Zealand and Canada. Originally from Southland, Blair moved to Auckland in 2018 and has spent much of the past eight years working on major transport projects—designing bridges, highways, and rail infrastructure. He recently joined Soil and Rock Consultants, where he’s now helping lead the technical delivery of commercial and residential developments across the upper North Island. Blair enjoys solving challenging ground problems, mentoring young engineers, and finding practical, down-to-earth solutions. Outside of work, you’ll find him playing golf (mostly from the rough), five-a-side football, or out exploring the world with his girlfriend and their dog.
John Frengley
John is an Engineering Geologist at Engineering Geology Ltd. Having studied Engineering Geology in Dunedin and Auckland. He has 5 years of experience, being based in Auckland working on a range of residential, commercial and mining projects that have taken him across New Zealand.
Sadeq Asadi
Sadeq is a chartered geotechnical engineer at Jacobs, based in Auckland, with 15 years of industry and research experience in New Zealand and internationally. Throughout his career, he has held several technical and operational leadership roles, contributing to a wide range of major geotechnical projects. Sadeq completed his PhD at the University of Auckland in 2017, where his research focused on developing a method to classify crushable pumiceous soils and creating design guidelines for the liquefaction assessment of pumiceous soils.