During his registered accountant postdoctoral education, Arjan joined KPMG Accountants in Amstelveen where he worked for more than 8 years, with his final position as audit practice manager. In addition to special assignments such as due diligence investigations, his responsibilities primarily consisted of audit assignments for organisations within the construction sector and pensions.
Following three years with De Nederlandsche Bank (DNB), Arjan joined the business conduct supervision transition to the Autoriteit Financiële Markten (AFM) in 2002. His final two years with the AFM were dedicated to his advisory role in the areas of integrity and internal organisation of investment and securities institutions.
Since 1 September 2005, Arjan serves as an independent advisor on financial regulatory legislation. In 2009, he completed his Executive Master of Compliance postdoctoral study at the Vrije Universiteit Amsterdam (VU).