Our Services
Standards-Based Assurance
Sustainability and ESG KPIs
GHG emissions, energy and renewables, supplier, water, waste and social metric verification
Voluntary reporting
Sustainability reports, climate-related risk reports, transition plans and investor disclosures
Regulatory reporting
EU regulations, country-level ISSB adoption, California regulations
Readiness and pre-assurance
Gap reviews, controls assessments, action plans
Product and value chain claims
Product footprints, LCAs, claims verification
Our approach
Independent assurance, transparent methods and clear action plans
About Us
Specialist sustainability assurance
Atveris is a specialist assurance firm focused exclusively on sustainability and ESG information. We provide independent, standards-based assurance over data, disclosures and claims, helping organisations meet regulatory requirements and stakeholder expectations with confidence.
Our work combines technical expertise, structured methodologies and clear reporting to deliver reliable, defensible outcomes you can trust.
Arnaud Brohe
Director
“Trust in sustainability reporting is built on evidence, independence, and rigor. Our role is to provide assurance that stands up to scrutiny.”
Helena Walsh
Director
“We take a data-driven, technology-forward approach to assurance. Through agile delivery and robust systems, we provide precise, scalable assurance built for change.”
Atveris Team
Experts in sustainability
Arnaud Brohé
Director
PhD Environmental Studies
M.S. Environmental Management
M.S. Management & Finance
M.A. Political Science & International Relations
Helena Walsh
Director
M.S. Climate Change, Management & Finance
B.S. Engineering (sustainable energy systems)
B.S. Computer Science
Victoria Tetzlaff
Lead Assurance Manager
MBA Business Administration & Management
B.S. Economics & Business Sciences
CFA ESG Investing
Atveris Insights
Browse Articles
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Limited vs Reasonable Assurance
Limited vs Reasonable Assurance As sustainability reporting matures and regulatory requirements increase,…
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GHG Verification: Ensuring Reliable and Credible Climate Reporting
At Atveris, we provide high‑quality emissions verification aligned with the ISO 14064-3…