Thea Marcelia Sletten, a Director at eftec, joined the team in 2018 as an expert in economics for chemicals regulation and now leads eftec’s chemicals policy work. She is a longstanding member of the Network of REACH SEA and Analysis of Alternatives Practitioners (NeRSAP) and provides independent advice to the UK government through the Independent Scientific Expert Pool (RISEP).

Her expertise covers a wide range of analytical tools, including socio-economic assessments, option appraisals, supply-chain analysis and regulatory mapping. She has played a leading role in advancing methods for assessing impacts of chemicals policy, including through the development of approaches for assessing environmental impacts of chemicals and Risk Management Option Analyses (RMOAs) guidance materials. She has practical experience across a wide range of national and international regulatory frameworks, such as REACH, CLP, the Water Framework Directive, the Industrial Emissions Directive and the Stockholm Convention. Her work has covered a wide range of substances and substance groups, including metals, microplastics, PFAS and other chemicals of regulatory concern.

Before joining eftec, she was the lead economist for chemicals policy at the Norwegian Environment Agency and, in 2013, was appointed to the Committee for Socio-Economic Analysis (SEAC) at the European Chemicals Agency (ECHA), where she served for over four years.

Thea holds a MSc in Economics, BSc in Mathematics and Economics, and a BSc in Astrophysics from University of Oslo.