Our office phone +31-35-6782108 and  email solutions4expats

Our Story

Solutions 4 Expats BV was established in April 2004 to provide high-quality US tax services for US citizens living and working outside the US as well as foreign nationals living and working within the US.

Since then our vision has continued to expand in pace with the unique needs of our international clients and the dynamic financial environments in which they live. With a generous knowledge of the special concerns and challenges facing US citizens living abroad as well as foreign nationals within the US, we are positioned to offer detailed, expert services and support ranging from basic US tax returns to more complex relationships.

Constanze Woelfle
Constanze WoelfleFounder and Owner
A licensed CPA with over 20 years of experience, Constanze specializes in US International taxation and maintains the most up to date knowledge in the areas of US individual and estate tax planning as well as worldwide tax strategies. She speaks English and Dutch fluently and has a good understanding of German and French. Constanze is originally from the San Francisco Bay Area, California. She started her career with PriceWaterhouseCoopers (PwC) in January 1995. She developed her professional knowledge at PwC while working in the Palo Alto, Frankfurt, and Amsterdam offices, culminating in the position of US Tax Manager in charge of the US International Assignment Solutions Team.
Colleen Pang
Colleen PangSenior Tax Consultant
Colleen Pang has been a part of our team since January 2012. She is an Enrolled Agent and has gained her experience with specialized US tax issues while working in our team over the last 5 years. Before becoming a U.S. Senior Tax Consultant, she had a career in providing market research data, assisting companies in making better marketing decisions, providing insight into their customers through the design, execution, and interpretation of market research studies. Her clients came from a wide range of industries, with projects covering North America, Latin America, Europe and Asia. Colleen first came to the Netherlands on a Rotary scholarship which funded a year of study at Nyenrode University where she earned an International MBA. She also holds a BA in broadcast journalism from USC Annenberg School for Communication and Journalism and an MBA from Northwestern University’s Kellogg School of Management. Colleen hails from Kailua, Hawaii.
Margaret Klein
Margaret KleinSenior Tax Consultant
Margaret joined Solutions 4 Expats in September 2013 and became a licensed CPA in February 2015. She holds a Bachelor of Arts from Indiana University and a Master’s of Business Administration from Seattle University. Her first experience in tax preparation and research was preparing tax returns for low-income Seattle-area residents as part of the Volunteer Income Tax Assistance (VITA) program. She learned that the US tax code can be tricky regardless of income or wealth. Margaret relishes helping clients both in the US and abroad navigate the complexities of US tax filing obligations.
Diana Scott-Smith
Diana Scott-SmithOffice Manager
With years of experience in client relations and operational management, Diana offers primary support to both Solutions 4 Expats clients and our team. Diana will often be your email contact as well as the voice you hear on the phone, providing you with assistance and helping you through the process of document gathering at the start of tax season and throughout the year. Diana is originally from Northern California and has a degree in Anthropology as well as professional training as coach and counselor. Diana is fluent in Dutch and English.
Hayley Walker
Hayley WalkerAdministrative Assistant
Hayley joined our team in April 2018. She is originally from a small town in Scotland and moved to Glasgow to study. She attended Glasgow Caledonian University and gained a 2:1 honors degree in Business with Human Resources, specializing in Performance Management with particular focus on Performance Related Pay. Having studied Human Resources she is qualified to work with your private and confidential information. Before moving to The Netherlands she spent 2 years working and traveling around Asia and Australia, which was a great experience! You will often have e-mail correspondence with Hayley as she’ll be helping you to complete the document intake process for your tax returns and FBAR filings.