Enhanced governance to guide GRI standard setting
Published date: 13 April 2026
Two Vice-Chairs and one new member appointed to the GSSB
The Supervisory Board of GRI has confirmed that the Global Sustainability Standards Board (GSSB), the independent governance body responsible for setting the GRI Standards, has revised its leadership structure by including a second Vice Chair.
The structural changes will support the GSSB’s effective collaboration, strengthen its global representation and reinforces its multi-stakeholder composition. A new member has also been added, following the departure of Giulia Genuardi who served on the GSSB for five years.
Announced today are the following:
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- Jeff Robertson (Director, Environment & Sustainability, Bimbo Canada) is reappointed as GSSB Vice-Chair for a further one-year term (representing Business Enterprise constituency);
- Tomoo Machiba (Managing Director, Zeroboard Research Institute, Japan) is added as a second GSSB Vice-Chair (Mediating Institution constituency);
- Isidora Diaz Heredia (Chief Sustainability and HSE Officer, Parques Reunidos Group, Spain) joins as a new GSSB member (Business Enterprise constituency).
The revisions to the GSSB follow the confirmation in January of Susanne Stormer as the new Chair, with her term underway as of 1 April 2026.
I’m pleased to welcome Jeff and Tomoo as Vice-Chairs, and I am delighted that Isidora has accepted the offer to join the GSSB. As Chair, I look forward to collaborating closely with all GSSB members to advance the credibility, relevance and not least adoption of the GRI Standards, in support of GRI’s mission.
Susanne Stormer, GSSB ChairI am excited to continue the important work of the GSSB in providing global leadership in sustainability reporting, helping organizations focus on material impacts and make better strategic decisions by linking environmental and social outcomes directly to long-term business value. I’d also like to take this moment to warmly thank Giulia for her commitment and contributions to the GSSB’s standard setting priorities during her time on the board.
Jeff Robertson, GSSB Vice-ChairThe value of the GRI Standards lies in their unique ability to provide a comprehensive framework for impact-based disclosure while evolving for the digital and AI-driven era. The GSSB is committed to advancing the Standards by crystallizing the interaction between impacts, risks and opportunities, while facilitating their use within global financial disclosure system. This enhanced interoperability empowers organizations to deliver high-quality data that builds trust and informs sustainable decision-making worldwide.
Tomoo Machiba, GSSB Vice-ChairReporting with the GRI Standards creates a common language for transparency and accountability. Beyond disclosure, the GRI Standards enable organizations of all sizes and sectors to use comparable qualitative and quantitative information to manage sustainability more effectively, embed it into decision-making, build trust, and contribute meaningfully to sustainable development
Isidora Diaz Heredia, GSSB Member