Our Sustainability and Resilience team has unmatched experience in climate change adaptation, lifecycle assessment, economic evaluation and sustainable future mobility.

Meet our team. 

Sustainability team 2020


Dr Clarissa Han

Clarissa Han

National Leader, Sustainability and Resilience

Dr Clarissa Han leads the Sustainability and Resilience team in delivering high profile research on recycled materials for road infrastructure climate, life cycle assessment and economic evaluations of transport options, and sustainable future mobility solutions.

Clarissa also advises our Future Transport Systems Division in her capacity as Principal Professional Leader with 20+ years of engineering and research experience in traffic studies and analysis, congestion cost estimation, transport management and operations, and emerging ITS technologies and tools.

After joining ARRB in 2007, Clarissa has been the major contributor to various national guidelines, standards and specifications in network operations, traffic management and ITS evaluation and benchmarking.

Clarissa is leading the Australian national forum on 'Excessive congestion cost and travel time reliability cost’. She is also researching and delivering the Movement and Place Framework and impact assessment of emerging transport modes on community, society and environment.

Clarissa is the Australian member of the PIARC Mobility Strategic Theme TC2.4 Road Network Operations/ITS (2020-24) and the Working Group Leader of TC2.4.2.

Brook Hall

Brook Hall

Principal Transport Economist

Brook leads the economics stream within the Sustainability and Resilience team. Brook is an accomplished and results-driven leader with more than 15 years of experience in state and national government agencies.

Since joining ARRB, Brook has led projects on life cycle and economic analyses, climate change adaptation, and implementing value creation and capture initiatives into major road projects.

Brook is an accredited Infrastructure Sustainability professional who can help infrastructure planners, designers, builders and operators evaluate life cycle sustainability impacts and economic costs and advise on viable innovations e.g. using recycled materials.

Brook specialises in stakeholder engagement and delivering outcomes that exceed customer expectations. He is passionate about environmental sustainability and delivering outcomes that maximise community and industry benefits.

Katie Gurrie

Katie Gurrie

Principal Environmental Engineer

Katie is a Principal Professional within the Sustainability and Resilience Team at ARRB and is leading the environmental management stream.

Her extensive environmental engineering and environmental law experience has supported large manufacturing and public organisations to understand their obligations, go beyond compliance and reduce environmental risks, lower costs, improve productivity and enhance their reputation.

Katie has developed and audited certified environmental management systems and evaluated environmental management plans.

Katie has project managed innovative cleaner production initiatives in the areas of waste, water and energy.

Melissa Lyons

Melissa Lyons

Senior Professional Leader, Recycled Materials

Melissa is a qualified Materials Engineer and Scientist who specialises in applied research and consultancy projects in the bitumen, asphalt and pavement materials space.

In the Sustainability and Resilience team, Melissa with State Road Agencies, sustainability agencies and industry bodies, such as Tyre Stewardship Australia, to fast track the use and specifications for recycled materials in road infrastructure.

In 2017–18, Melissa was seconded to Victoria DoT (VicRoads) where she helped manage and deliver road rehabilitation projects across Victoria.

Dr Robert Kochhan

Robert Kochhan

Senior Transport Economist

Robert is a qualified Engineer and Economist with a PhD in Economics and Management.

He has extensive knowledge and international experience working on battery-electric vehicles and related future transportation systems, having researched and developed projects on future urban transportation and sustainable mobility solutions in Singapore and Germany.

He has also been involved in solar-electric vehicle design and development, including Australian World Solar Challenge events as a member of a Brisbane-based solar car team.

At ARRB, Robert is studying congestion impacts of smart parking innovations and developing a sustainability assessment model for measuring life cycle greenhouse gas emissions and costs for innovative pavement designs.

Dr Jenny Trochez

Jenny Trochez

Senior Professional, Recycled and Alternative Materials

Jenny is a resourceful materials scientist and engineer and has delivered in projects involving the use of recycled materials in road infrastructure.

Jenny has completed a PhD in Materials Engineering in Colombia where she worked on construction materials projects such as geopolymeric concretes and the use of industrial waste to develop supplementary cementitious materials.

Jenny has also lectured undergraduate Materials Engineering students in Ceramic, Polymer Materials and Physical Chemistry Laboratory.

Dr James Grenfell

James Grenfell


Senior Technology Leader, Recycled and Alternative Materials

James leads the recycled and alternative materials stream within the Sustainability and Resilience team.

He is currently working on several projects related to the utilisation of waste resources in road infrastructure. These are focused on glass in asphalt and in granular sublayers. He also has plenty of experience looking at reclaimed asphalt pavement, crumb rubber modified asphalt and warm mix asphalt technologies.

Since joining ARRB James’ work has been focused on improving knowledge on foamed bitumen stabilised pavements and the use of lightly cemented materials in pavement construction.

He has also conducted new research on the addition of nanosilica to asphalt to improve properties and the addition of recycled crushed glass to asphalt to help reduce waste stockpiles.

James has a PhD in Metallurgy and Materials from the University of Birmingham in the UK.

James worked for 13 years as a researcher at the Nottingham Transportation Engineering Centre at the University of Nottingham in the UK. During this time, he worked on and managed projects involving the permanent deformation and fatigue properties of asphaltic materials, moisture damage in asphalt pavements, adhesion of bitumen to aggregate, warm mix asphalt technologies, the use of crumb rubber and recycled asphalt and alternative binders.

His main research interests are the fundamentals of adhesion, moisture damage of asphaltic materials, recycling and the use of secondary materials.

He has published more than 100 journal papers and peer reviewed conference papers. He is a Director-at-large of the International Society of Asphalt Pavements, on the Editorial board for the Proceedings of the Association of Asphalt Paving Technologists and involved in several RILEM Technical Committees looking at bituminous and asphaltic materials.

Lydia Thomas

Lydia Thomas


Professional Environmental Engineer

Lydia is a skilled Environmental Engineer who specialises in sustainability, safety and future mobility research and evaluations.

Her project successes include life cycle greenhouse gas emissions, and cost evaluations for innovative pavement designs, the Pedestrian Investment Program Evaluation for the Safe System Road Infrastructure Program, and the short-term evaluation of raised safety platforms.

In successfully delivering these projects, Lydia has developed skills in project management, data processing, survey design, stakeholder consultation, and moderating focus groups.

She is currently working on various life cycle evaluation projects, "Towards Zero" safety features study for the Victorian Department of Transport and other projects relating to recycled materials in roads.

Dr Simon Xue


Senior Professional Economist

Simon has over 10 years of experience in the applications of economic analysis and research to infrastructure project evaluation, regulation and policy questions. His sector experience includes public transport, highways, shipping ports, environmental and natural resources, and retail petrol markets.  

Simon has evaluated the benefits of nourishing public beaches in South Melbourne, and developed a cost-benefit analysis framework to evaluate the return on maintaining public coastal assets in the context of climate change.

Simon also contributed to the competition monitoring and government intervention framework for the container stevedoring industry in South Australia.  He was also an advisor to a brown coal development company, where he has provided advice on the financial, economic and regulatory feasibility of a green-field project that held significant economic potential for Victoria. 

Simon holds a PhD in economics from the University of Melbourne and his work has been published in the Australian Economic Review.


Umer Chaudhry

Sustainability Umer Chaudhry circular

Senior Professional, Recycled and Alternative Materials


Umer is a Ph.D researcher at Monash University with extensive experience in the design and analysis of  experiments, materials synthesis and testing, product development/formulation, technical report writing, pilot-scale plant commissioning, installation, and operation.

Prior to joining ARRB, Umer worked on a project funded by Tyre Stewardship Australia for the process intensification of waste to energy technology which involves the fundamental scientific research and commercialisation of scrap tyre Pyrolysis process.

Stewart Pike


Senior Technology Leader, Recycled and Alternative Materials

Stewart is a qualified Civil Engineer with over 10 years’ experience in the design and construction of civil infrastructure. His project experiences include road constructions, signalised intersections, major drainage upgrades, sports field developments and bridge replacements. Stewart is a Chartered Professional Engineer (CPEng) in the schools of civil engineering and project management with Engineers Australia. He is currently completing a Master of Engineering at RMIT specialising in transport infrastructure.

Prior to joining ARRB, Stewart worked as the Civil Projects Coordinator at the City of Greater Dandenong where he managed a team of engineers and construction supervisors delivering approximately $20 million in civil design and construction work annually. Stewart is currently working on various projects related to the utilisation of recycled materials in road infrastructure. These are focused on the use of recycled crushed glass as a bedding and backfill material, increasing the use of reclaimed asphalt pavement in asphalt mixes with polymer modified binders and the use of crumb rubber in open graded asphalt.

Find out more about how ARRB’s Sustainability and Resilience team can assist you: