Who we are

Dennis Houthoofd
Dennis Houthoofd

Dennis is Partner at vestigium and horsum. He has more than 15 years of relevant professional experience. Dennis started his career at Deloitte, first as external auditor, later as consultant in the Enterprise Risk & CFO services department. In 2008, Dennis joined Barco, an international high-tech company. In 2011, Dennis founded horsum.

Dennis Houthoofd has a master's degree in Applied Economics (2001 - University of Antwerp). In addition, he obtained an executive master in Controllership (2009 - Vlerick Business School), a post-graduate in Integral Product Development (2012 - University of Leuven), a certificate with distinction in 'Process Mining: Data science in Action' (2015 - University of Technology Eindhoven) and an executive master in ‘Creating Business Value with Big Data’ (2016 - Vlerick Business School). In 2019, he obtained a certificate in 'Board Effectiveness' (2019 - Guberna).

Sofie Defraeye
Sofie Defraeye

Sofie Defraeye is Partner at vestigium and horsum. She focuses on digital transformation, process optimizations, data analyses and internal audit engagements.

In 2008, Sofie started her career as an internal auditor at Deloitte. In 2012, she joined Colruyt Group as internal audit and risk manager. Four years later, she became member of the management committee of Dreambaby, the baby retail division of Colruyt Group.

Sofie holds a master’s degree in Applied Economics (2008 – KULeuven) and an executive master in Controllership (2015 – Vlerick Business School).

Frederik Vervoort
Frederik Vervoort

Frederik is Partner at vestigium and clipeum and has more than 19 years of professional experience in various financial and compliance functions.

Frederik started his career at PwC in 2001 where he gained extensive experience in external audit, internal controls, SOX, reporting, people management and coaching. After 7 years PwC and 2 years as accounting manager, Frederik started working as an interim manager late 2010. He completed various projects at large and medium-sized companies, including financial controlling, financial reporting, ERP transitions, business process management, internal audit and risk management. He mainly focuses on consultancy in the field of information security, data protection and internal audit.

Frederik has a master’s degree in Applied Economics (2000 - University of Antwerp). He also obtained a postmaster in Tax (2001 - KU Leuven). More recently, Frederik obtained a certificate with distinction in "Process Mining: Data Science in Action" (2015 - Technical University of Eindhoven) and a certificate with distinction in “Data Analytics” (2016 – Wharton University). In February 2017, he successfully completed his training as “Data Protection Officer” (Data Protection Institute, Mechelen).

Mathias Roef
Mathias Roef

Mathias is registered Aauditor at vestgium and Vandelanotte.

Mathias Roef started in 2008 as an external auditor at Constantin Bedrijfsrevisoren, which was intergrated in the Vandelanotte Bedrijfsrevisoren network in 2012. In the context of the statutory audit of the annual accounts, he is the legal representative of Vandelanotte Bedrijfsrevisoren at dozens of companies and bears final responsibility for the mandate as statutory auditor. In his role as company auditor, he can rely on a great deal of audit experience of service and production companies, and this in the context of both large Belgian companies and companies that are part of large international groups.

Mathias completed a Master's degree in Applied Economic Sciences (2008 - Vrije Universiteit Brussel). Since 2016, he has been registered as a company auditor in the public register of the Institute of Company Auditors (Instituut van de Bedrijfsrevisoren) under member number A02528.