Stacks Image 7
Lyke is a Tax Lawyer and Partner of Hillbrook and has over 20 years’ experience in the field of expatriate tax, international mobility and assignment management. Before joining Hillbrook in December 2013, Lyke worked for almost 2 years with Boxx, an expatriate consultancy firm in Belgium. Prior to that, she worked for more than 13 years in the International Assignments group of PricewaterhouseCoopers, managing several large client engagements and providing technical advice and guidance to HR, Tax and Finance professionals on all aspects of assignments including compensation, tax and HR issues. She was also responsible for the Sales & Business Development of the International Assignments group. Since 2012 Lyke has been a teacher at the Expatise Academy, teaching the subject ‘Understanding the system of international taxation and the avoidance of double taxation’.

Lyke’s area of expertise is in international tax and social security planning for expatriate individuals, but also has a broad knowledge of immigration/visa and experience with outsourcing projects. Lyke has a degree in both Civil Law and Tax Law.
Stacks Image 6
Henk is a founding member and Partner of Hillbrook. In 2009, he branched out on his own after spending over 15 years with Arthur Andersen and Deloitte. As a Senior Director in Deloitte’s International Assignment Services department, he was responsible for major client engagements and providing specialist expatriate tax and HR consultancy services. Henk was a teacher of cross border employment for 4 years at the Dutch Association of Tax Advisers (NOB). In 2013, he became a teacher again at the Expatise Academy, teaching global mobility (GM) professionals on the 30%-ruling. Further, Henk is very much engaged in the GM industry in the Netherlands and is the Chapter Leader of the Forum for Expatriate Management (FEM) in the Netherlands. In this capacity Henk organizes quarterly FEM seminars for GM professionals on different trending topics such as immigration, talent management, international employment law, policy benchmarking, 30%-ruling and other GM topics.

His area of expertise is expatriate tax compliance and consultancy. Henk has written a booklet on the 30%-ruling and numerous published articles on cross-border employment. As from 2004, he has been an author for the monthly payroll magazine ‘Praktijkblad voor de Salarisadministratie’.
Stacks Image 7
Gwen joined Hillbrook as of September 2016 as an Immigration Director. Gwen has 19 years of experience in Dutch Immigration compliance. Before joining Hillbrook she was heading the immigration team of Deloitte in the Netherlands. Before Deloitte she was manager within the immigration department of PwC. Gwen has successfully managed global tax and immigration client accounts in a number of industries, including engineering, retail and IT. She has extensive consulting experience in establishing immigration processes and finding solutions for complex immigration situations. Next to her in-depth immigration knowledge, Gwen also has knowledge of the Dutch tax and social security system.

Gwen is a regular contributor to Dutch immigration policy forums and has published several news articles. She has given multiple workshops on Dutch immigration. She has a Bachelor’s degree in Management Economics and Law.


Hillbrook Expatriate Tax Solutions was originally founded in 2010 by Erik Heslenfeld and Henk Amorison, two former Price Waterhouse colleagues. In 2015 Lyke Apontoweil joined Hillbrook as a partner. Identifying a niche in the market and combining their expertise in the wide field of expatriate taxation, Erik, Henk and Lyke have grown Hillbrook’s business on the basis of personal referrals, always trying to exceed their clients’ expectations. As of 2016 Hillbrook also provides immigration services, to achieve the much requested one-stop approach for both tax and immigration services. Gwen Keller, immigration Practice Leader from Deloitte, joined Hillbrook in 2016, to set up Hillbrook’s immigration team.

By combining tax and immigration Hillbrook provides practical, tailor-made services covering all aspects of global mobility. Furthermore, our services do not end at the Dutch border. Over the years we have built an extensive network of like-minded foreign partners. As a result, you can expect our high level of service in both the home and host country. Depending on your needs, you can liaise with our foreign partners directly or we can act as coordinating office.

Our practical and personal approach has resulted in a rapidly growing client base, ranging from individuals to small and medium-sized enterprises to multinationals. No matter the size of the client, we always take the time to understand your needs.