Our team combines decades of entrepreneurial experience, legal expertise, and global networks — serving wealthy families and entrepreneurs with the highest standards of discretion and professionalism.
"Behind every mandate is a team that treats your interests as their own — with no conflicts, no bank ties, and no agenda other than yours."
"Over 30 years of accompanying families and entrepreneurs — across borders, cultures, and generations."
Marcus Hartmann co-founded GT Family Office in 1993 and built it into an internationally recognised institution. A serial entrepreneur and committed fiduciary, he has accompanied countless families and founded and developed companies across the globe over the course of his career.
He is a specialist in international tax and corporate law, with particular expertise in double taxation treaties and cross-border company structuring. With more than 30 years of entrepreneurial and international experience across Europe and Asia, he offers deep insight into the challenges faced by wealthy families and entrepreneurs.
His extensive global network, strategic advisory expertise, and profound understanding of international regulatory frameworks make him a trusted advisor for complex international matters. He is also recognised for his strong command of foreign markets, cultures, and legal systems — for both private individuals and corporate entities.
Georgina Seraina Hartmann leads the operational management of Primax Group AG, ensuring that every client mandate is executed to the highest standards of quality, continuity, and discretion.
As CEO, Georgina Seraina Hartmann brings continuity and a forward-looking perspective to the firm — reinforcing Primax's position as a trusted, independent family office for the most discerning private clients and corporate entities worldwide.
Her leadership ensures that the values on which Primax was founded in 2002 — independence, discretion, and an unwavering focus on client interests — remain at the heart of every mandate the firm undertakes.
We are bank-independent, family-owned, and free of any product incentive. Our advice is given solely in your interest — always.
We plan in decades, not quarters. Every structure we build, every relationship we form is designed to endure across generations.
Our network spans continents, but every client relationship is personal — handled directly by our team, not delegated to junior staff.
Where we do not hold the expertise in-house, we connect you with the right specialist from our global network — always independently selected, never commercially driven.
Top-tier law firms across Switzerland, Europe, Asia, and beyond — for every jurisdiction and legal matter.
Independent asset managers, custodian banks, and financial specialists — selected purely on merit.
M&A advisors, corporate consultants, and business development experts across sectors and geographies.
Trusted co-advisors for specific mandates — from domiciliation specialists to art advisors and estate planners.