Our Team

Some of our team members

Rebecca Butler-Madden

Principal Transport Planner

Becky is a Senior Transport Planner with over 8 years’ experience in local government and private consultancy fields.

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Having worked in Australia and the United Kingdom, Becky has acquired a broad knowledge base in the traffic and transport industry. During this 8-year period, Rebecca has undertaken numerous projects for both private developers and Government Agencies across a range of industry sectors.

Her planning background has provided her with strong strategic skills and she has a specialisation in travel planning, having worked extensively with various British Universities to develop and manage their travel plans. This included helping the University of Bath achieve a Gold Award from the Travelwest Travel Plan Accreditation Scheme.

Past projects have ranged in size from small residential developments to the preparation of Traffic Impact Assessment (TIA) and Transport Management and Accessibility Plans (TMAPs) for large Planning Proposal submissions.

Ason Groups:

Other Key Personnel:

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Tim has a Bachelor of Civil Engineering and demonstrated ability in transport planning.

Tim Lewis

Principal Lead – Development Assessment & Advisory

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Andrew Johnson, a founding director of Ason Group, is a Civil Engineer with over 20 years of experience in the Transport Planning and Engineering industry.

Andrew Johnson


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Piran Trethewey, a founding director of Ason Group, is an experienced traffic engineer with expertise in the areas of traffic engineering analysis and assessment.

Piran Trethewey