our experts

Do you have questions? Get in touch with our experts.

Corporate Services

  • Stefan Ruppert

    Managing Partner
    Expert-Comptable

    your expert for credit & securitization

    • Real Assets
    • Private Equity
    • Private Debt

    With a solid foundation in the financial services sector over two decades, Stefan has become a distinguished business leader with a focus on corporate governance, client relationship management and fund administration services within the corporate and private capital space.

  • Thomas Weber

    Managing Partner

    your expert for private equity & infrastructure

  • Thomas Probst

    Managing Partner

    your expert for real estate & private equity

Fund Solutions

  • Oliver Collmann

    Partner

    your expert for fund administration

    • Réviseur d'Entreprises 
    • Chartered Accountant 
    • Alternative Investment Experience
    • Regulatory Expertise
    • Financial Markets

    Oliver is a Partner at Avega Fund Services S.à r.l. (AFS) and serves as a Board Member, Conducting Officer and RC. Prior to joining AFS, he held the position of Associate Partner at KPMG Luxembourg.

    Oliver holds the qualification of Réviseur d’Entreprises (Luxembourg), and Chartered Accountant (UK). He has extensive experience servicing a diverse portfolio of multinational clients within the Alternative Investment sector, bringing over 17 years of specialized expertise to the firm.

  • Frederik Stein

    Partner

    your expert for fund administration

    • Fund Administration
    • Regulatory Expertise
    • Alternative Funds
    • Financial Markets 

    Frederik serves as a Partner at AVEGA Fund Services S.à r.l., where he is a Board Member and Conducting Officer based in Luxembourg. He is responsible for driving operational effectiveness across AFS’s fund administration activities – designing robust processes, strengthening controls, and embedding a KPI-led continuous improvement culture. Frederik also sponsors technical solutions, aligning platform strategy, workflow automation, and data architecture to enhance scalability, transparency, and client reporting. He keeps client quality at the heart of his work, making sure services are consistent, governance is strong, and relationships are managed proactively to deliver dependable results for alternative investment fund clients.

    Prior to joining AFS, Frederik held various roles within fund administrators of alternative funds, building a deep understanding of operating models and regulatory expectations while leading teams through transformation and growth. He integrates people, process, and technology to achieve measurable results and sustain quality at scale.

  • Jens Eisenbart

    Partner

    your expert for AIFM-Services

    • Alternative Investments
    • Investment Management
    • Regulatory Expertise
    • Structuring
    • Financial Markets

    Jens is a Partner at AVEGA Fund Services S.à r.l. (AFS), leading the operational management and strategic growth of the firm’s AIFM services division. With more than 18 years of experience in Luxembourg’s fund and investment management industry, he combines deep regulatory expertise with a proven track record in building efficient operating platforms.

    His career is marked by shaping scalable operating models and driving organizational growth while ensuring robust governance and risk management frameworks. Jens is recognized for his client-centric approach, and commitment to operational excellence. He continuously fosters collaboration and high-performing teams to deliver sustainable value to clients and stakeholders.

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