Invaluable cross-border expertise and peace of mind Working with Guillaume has been an absolute game-changer for our family. Navigating two different financial and tax systems can feel overwhelming, but Guillaume’s deep knowledge and structured approach immediately put us at ease. He is an exceptional listener who takes the time to truly understand your long-term goals rather than offering a one-size-fits-all solution. Thanks to his guidance, we have a clear, cohesive strategy for our investments, retirement, and cross-border planning. Guillaume is professional, transparent, and a true fiduciary in every sense. I highly recommend him to anyone looking for a trusted financial partner.

Guillaume has served as an outstanding advisor for many years. He consistently responds quickly by email. His understanding of tech companies benefits allows him to adapt guidance to your particular needs. I have relied on his judgment and advice for many years without hesitation. I’ve recommended several friends to his firm and they have been as satisfied.

My wife and I have worked with Guillaume for a one-time consultation. He was very professional, made himself available even beyond the call that we had paid for. He has this very deep knowledge of our specific situation as French-American. Thank you for your professionalism Guillaume.

We only have great things to say about Guillaume and his work ethics/professionalism. With his robust financial knowledge and experience, our portfolio is in very good hands. We do not have to worry about markets fluctuations. Guillaume is also an excellent listener with a very transparent communication style. He always finds solutions to adapt to any situation and understands his clients’ mindset and goals.

Working alongside with Guillaume has been a wonderfull experience. So professionnal and though human kindness. Thank you for those 9 years of advisings.

I have been working with Guillaume and Oui Financial for over two years now. Thanks to them, I went from a reasonable financial saver to an informed investor, with a knowledge of all the best practices, and a clear long term plan to meet my goals. Having someone who knows the rules for both the US and France is a huge bonus as well. Finally, my portfolio performance is great! I really recommend Oui Financial to anyone who needs a trusted financial planning partner.

I had a lot of questions about retirement planning and financial assets access wether I would choose to move back to France vs to stay in the US. Oui financial and Guillaume Decalf in particular provided me with answers and their expertise helped me grow my portfolio as well as gave me a solid understanding of what to expect once retired in a few months. Guillaume is very knowledgeable and easy to talk to.

I really enjoyed the white glove experience from initial explanation from Guillaume until completion of the process and getting documents notarized.

I first learned from Guillaume through Oui Financial's targeted, informative webinars and more recently through his podcasts and - most valuably - during our regular consultations. It's reassuring how well Guillaume understands and anticipates my exact needs. I trust his fiduciary management of my portfolio, and thanks to his advice I've been able to anticipate and sidestep obscure pitfalls, and I now feel confident in my planning decisions.

Guillaume is always attentive, available, and gives excellent advice. A true professional and very kind.

Hi, Currently in life transition, I have used the services of Oui Financial and worked with Guillaume Decalf regarding planning a future expatriation or future extended stays in France, finding the best way to transfer money from the US to France or advices about the financing of a property in France. In each occasion, Guillaume went beyond expectations in opening my horizons on financial possibilities or red flags, kindly guiding me and educating me so I could make my own informed decision. I would and I'm recommending Oui Financial and Guillaume without reserve to French/Americans that have or are thinking of a cross-countries financial life. Guillaume is not only a very competent professional, he is very patient and a very kind person.

Guillaume is a terrific advisor, exactly what you hope for but rarely find. He was deeply familiar with issues for expats and cross-border financial questions, professional, and punctual. Most importantly he was straightforward about fees, never pushy, and clearly cares about building long-term relationships.

When a certain political event occurred, it triggered our desire to liquidate everything and buy property overseas. We decided to seek professional guidance first. We were very pleased when we found Oui Financial, a Franco-American specialized firm. The initial consultation went better than expected. We felt able to talk honestly and frankly about our finances. The proposal was quickly accepted, and the data collection was easy. Oui gave us the news straight away: We can retire at this age. We can afford to buy property, or rent and live the life of nomads for a while. The kids might even get a boost at the end. What a relief. Seriously, a weight lifted off our shoulders. We told our friends. We've recommended Oui Financial to others who asked how we managed to be so confident. But for us, the sense of relief and confidence stays with us to this day. Give Oui Financial a try. You will not be disappointed.

We are very grateful for Guillaume's work with us. He understood our financial situation quickly and thoroughly, and gave us clear, specific steps to take. We felt genuinely well taken care of and would recommend him to anyone looking for a financial advisor who takes the time to actually understand your circumstances and is super knowledgable about the complex nature of investments and retirements for everyone, especially people dealing with changing realities across multiple countries.

Guillaume brings an exceptional individualized approach to wealth management. He takes the time to understand not only financial objectives, but also the needs and priorities of the family and the couple. His high emotional intelligence allows him to discern where there is natural alignment and where different options need to be thoughtfully presented and discussed. He is remarkably responsive and has built a small, highly selected and carefully curated team that provides attentive, high-quality support. A truly personal and thoughtful approach to wealth management.

We've been with WE financial (prev. OUI financials) since 2021 when we decided that we would return to France at some point. We chose WE financials because Guillaume's explanations were crystal clear, because they had no particular product to sell (a concern that some of their competitors were raising), and we could see that through their recommendations, they had our best interest in mind. Since then, not only were we satisfied as our portfolio performed exactly as intended as compared to the main indicators, but also because Guillaume put us in touch with reliable and high performing other professionals (attorneys, CPA's, lawyers) enabling us to have the perfect team around us to deal with the complexity of being French American dual citizens now French residents. One thing that I particularly appreciate is Guillaume's availability and responsiveness. Over the years I have seen WE financials grow in terms of staff and offering. All this makes me confident I've made a good choice and established a robust relationship to build my family's financial security.