Joost Siemensma

Joost is the founder of SINCERIUS and has more than 20 years of working experience in the field of Financial Due Diligence ("Transaction Services"). During this period, he has worked in various sectors for both private equity and strategic clients.

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

Before founding SINCERIUS, Joost spent 10 years with the Big Four (in Amsterdam and London). After 5 years at KMPG and 5 years at Deloitte, Joost decided to start his own company, focusing on delivering added value. Joost obtained a master's degree in business administration and a postgraduate degree in accountancy from Erasmus University Rotterdam.

In addition, Joost is pleased to share his knowledge in the field of Financial Due Diligence with peers and other financial professionals involved in mergers and acquisitions. This is why he gives financial due diligence courses for Chartered Accountants and Chartered Controllers through the NBA-VRC and Alex van Groningen. He is also involved in training young private equity professionals as a lecturer for the Dutch Association of Venture Capital Companies (NVP).

When Joost is not at work, he enjoys sports and can be found on the tennis court. In winter he will be on the ice rink preparing for the next Elfstedentocht. Joost is married and has two sons.