Mathieu currently leads the Market Codes team at ACER. 

The team is responsible for all the ACER decisions related to forward, day ahead, intraday and balancing markets. 

The team is also responsible for the new rules on demand response.

Before ACER, between 2007 and 2020, Mathieu worked at the Dutch regulator ACM working on the same topics. Mathieu started his career, after a Master in Power Systems Engineering at the TU Delft, at the Dutch DSO Stedin.