He was one of the architects of the devaluation of the Belgian Frank in 1982 when he worked at the cabinet of Wilfried Martens in the government Martens V. As governor of the NBB, he prepared the entry of Belgium to the euro in 1999.
As a key figure, he played a crucial role in devaluing the Belgian Franc in 1982 while working for the cabinet of Wilfried Martens within the Martens V government. Later, as governor of the NBB, he oversaw Belgium's transition to the euro in 1999.