Martijn began his position as professor of the New Finance research group in 2018. His dissertation at the TU Delft was completed in 2022, regarding the design of the monetary-financial system in the digital age. His research relates to new forms of digital money (CBDCās, stablecoins and cryptos), the liberalisation of banks, mechanisms in the monetary system that contribute to inequality and financial instability, as well as monetary policy and reform proposals.