Joost Siemensma


Joost (1972) is the founder of SINCERIUS. After his studies in business economics at Erasmus Universiteit in Rotterdam and having gained experience at KPMG and Deloitte (in Amsterdam as well as London), het set course in a different direction.

“I wanted to do it differently, to add value instead of billing hours”.

Next to this Joost likes to share his knowledge on financial due dilligence with collegues and other financial professionals involved in mergers and acquisitions. For this reason, he teaches due dilligences courses through the The Royal Netherlands Institute of Chartered Accountants (NBA-VRC) for chartered accountants (RA's) and chartered controllers (RC's). Whenever Joost is not working, he is often found on the tennis court, the hockey field and on the ice rink in the winter, in preparation of the next 'Elfstedentocht'. Joost is married and has two sons.


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