The market leading team at Walder Wyss Ltd. caters to both federal and cantonal authorities, as well as major multinational companies, offering advice on the full range of public law mandates, from public procurement and energy law to transport and international sanctions. Martin Zobl steers the practice and specialises in public commercial law and administrative litigation. Hans Rudolf Trüeb has a wealth of experience advising on technology, telecoms, energy, competition and public procurement law. Daniel Staffelbach is a key contact for clients in the healthcare and life sciences industry, while Ramona Wyss is an expert in energy law. Lena Götzinger took up an in-house role in September 2025.

Legal 500 Editorial commentary

Testimonials

Collated independently by Legal 500 research team.

'Hans Rudolf Trüeb is a sharp thinker, excellent writer and explains everything in easy words.'
'Ramona Wyss is a strong communicator, can take the client by the hand and navigate through choppy sanctions waters.'
'Strong specialist expertise in public procurement law, with consistently prompt delivery.'
'The team is adept at conducting procurement proceedings and managing procedural matters effectively.'
'Hans Rudolf Trüeb has outstanding expertise in procurement law.'
‘The Walder Wyss public law team is unchanged the undisputed market leader. They offer advisory and litigation services in public economic law in an exceptional way with highest quality.'

Key clients

AEW Energie AG
Amgen Switzerland AG
armasuisse
Axpo Group
Canton of Zurich - Office for Water, Energy and Air
Canton of Zurich, Direktion der Justiz und des Innern
Canton of Zurich, Office for ICT
Cantonal Hospital of Zug
EnBW Energie Baden-Würtemberg
Energie 360 Grad AG
Energy Infrastructure Partners
ENGIE

Work highlights

Represented Swiss Federal Railways in numerous court proceedings.

Represented armasuisse in various public and administrative law matters, including public procurement proceedings before the Federal Administrative Court.

Advised the Hirslanden Group on a wide range of public law and regulatory matters.

Lawyers

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