Jaap Koelewijn (1956) is part-time Professor of Corporate Finance at Nyenrode Business Universiteit. Jaap studied general economics at VU University Amsterdam before obtaining his doctorate at the same institution with a thesis on business supervision of the banking industry.

Jaap has held various research positions within the financial sector, including as an European financial markets stock analyst and asset manager at MeesPierson; head of strategy and research vice-president at IRIS (a joint subsidiary of Rabobank and Robeco); and head of research at the Netherlands Authority for the Financial Markets (AFM). In addition to his substantive expertise, Jaap has extensive experience both as a manager of professional teams and as an administrator. 
Drawing on his scientific, financial and supervisory experience, Jaap started his own consultancy firm called ‘Financieel Denkwerk’ (Financial Brainwork) in 2000. Concentrating on financing and investment issues on the one hand, and on related regulations and integrity concerns on the other, his main activities are carrying out research, offering well-founded advice and developing strategies for his clients. 
Jaap is a trainer for professionals, post-graduates, compliance officers, investment consultants and asset managers. He is a researcher for - and advisor to - large accountancy firms, financial institutions, law firms, the Public Prosecutor and supervisors. In addition, Jaap holds several positions on supervisory boards, assessment committees and administrative bodies, and regularly publishes articles – including for the Financieele Dagblad – and gives presentations.