Our team

We from TNAS believe in a hands on and personal approach and we are committed to provide an efficient and professional service.

Eelco van Solkema
Co-Owner & Managing Partner

Eelco Solkema holds a Master’s degree in tax law. He worked as an international tax partner at PwC Amsterdam and PwC London with a focus on the UK. Eelco is specialised in international tax and has assisted companies with their international tax matters for almost 30 years. His experience also includes tax compliance, accounting, and corporate governance.

Geoffrey Kuppens
Founder & Managing Partner

Geoffrey holds a degree in Fiscal law & Dutch law. Geoffrey Kuppens worked as an international tax manager at PwC Rotterdam and PwC London with a focus on the UK and energy market before he started his first own company Dutch Trust Services (DTS). Geoffrey was together with Eelco van Solkema the driving force behind TNAS which they established in 2016 and which organisation has grown into a professional service provider with a variety of clients.

Hyang Jung Kim
Accounting Officer

Hyang Jung Kim has a Korean Certified Public Accountant licence and a master degree in Accountancy and Control from Amsterdam University. Hyang Jung worked as a manager at PwC Korea and PwC Amsterdam over 8 years and joined TNAS in 2019. Hyang Jung is a native Korean speaker and speaks English fluently.

Hans van Loon
Head of Accounting

Hans is specialised in tax compliance. Hans started his career with the Dutch tax authorities and was a tax inspector and state auditor for 16 years. Subsequently, Hans worked for 15 years as an international compliance tax manager at PWC Amsterdam for international enterprises. Hans speaks English, German fluently and joined TNAS in 2016.

Mark Verhaaren

Mark has a Master’s degree in fiscal economics and has a focus on compliance, corporate responsibility and tax reporting. Mark worked for 13 years in the tax, reporting, and strategy department of PWC and has extensive experience in the audit of tax and complex tax filings.  Mark joined TNAS in 2021.