CDSB Secretariat team

The Secretariat delivers CDSB's strategy and engages with stakeholders to provide decision-useful environmental information to markets.

Lois Guthrie – Founding Director

Lois has led the development CDSB’s Technical Work Program including the frameworks for reporting climate change-related and environmental information in mainstream annual reports. Lois also serves on the ACCA’s Global Forum on Sustainability and a member of Carbon Tracker’s Advisory Board. Previously, Lois was Technical Director of the Group Tax Department in Zurich Financial Services, Technical Director to the International Integrated Reporting Council (IIRC) and was part of the development of its integrated reporting framework and Technical Director where she was the author of the first CDP questionnaire.

Mardi McBrien – Managing Director

Mardi McBrien joined the Climate Disclosure Standards Board (CDSB) as Managing Director in 2011 following an eclectic career which has included roles such as President of an International Students Association, public-private partnership management, leading flagship environmental campaigns including for the Campaign to Protect Rural England (and the author Bill Bryson) and WWF-UK’s Earth Hour and carbon market policy for UK’s Department of Energy and Climate Change (DECC). Mardi is a member of the GRI Stakeholder Council, a trustee of the International Tree Foundation and a founding board member of WOCAN — Women Organising for Change in Agriculture and Natural Resource Management. Mardi holds a double degree in Forestry and Environmental Science from the University of Melbourne and a MSc in Agricultural Economics from SOAS, UCL. In 2013, Mardi was awarded environmental campaigner of the year by the Sheila McKechnie Foundation. In her spare time, Mardi dreams of her next career as owner and manager of a boutique gin distillery in her home town of Melbourne.


Michael Zimonyi – Policy & External Affairs Manager

Mike leads CDSB's policy and external affairs work. He joined CDSB in 2012 and focuses on policy and corporate engagement and oversees external affairs. Prior to joining CDSB, Michael has worked at a global pharmaceutical corporation and at the sustainability think tank Forum for the Future. Michael has a degree in Chemistry with Environmental Science from the University of Birmingham and has been a member of the Royal Society of Chemistry.


Luke Blower – Senior Technical Officer

Luke is a sustainable development professional specialising in sustainability and non-financial reporting. He develops and leads research and analysis of policy, regulation, frameworks, standards, current reporting practice, and supports stakeholder and corporate engagement activities. Luke has an environmental and biological science background focused on ecosystem functioning and ecosystem services. He holds an MSci Marine Biology degree from the University of Southampton.


Gemma Clements - Project Officer

Gemma joined the CDSB Secretariat to support CDSB's technical and communications work. After working as an environmental educator for 4 years in London she completed an MSc in Environment and Development from the London School of Economics and Political Sciences. This role builds upon her interests in non-financial reporting, sustainability and climate change.

, @ClemGemma


Denise Puca - Communications Manager

Denise joined CDSB in 2016 to support its communications, media and marketing strategy. Prior to this role, she worked in communications across different climate NGOs, including The Climate Group and We Mean Business. She provided support for the communication campaigns around key moments for the global climate agenda, from Climate Week NYC to COP21. She holds an MA in International Journalism from Cardiff University.