our experts

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

Corporate Services

  • Stefan Ruppert, Managing Partner at AVEGA Luxembourg - Portrait

    Stefan Ruppert

    Managing Partner
    Expert-Comptable

    your expert for credit & securitization

    • Real Assets
    • Private Equity
    • Private Debt
  • Thomas Weber, Managing Partner at AVEGA Luxembourg - Portrait

    Thomas Weber

    Managing Partner

    your expert for private equity & infrastructure

  • Thomas Probst, Managing Partner at AVEGA Luxembourg - Portrait

    Thomas Probst

    Managing Partner

    your expert for real estate & private equity

Fund Solutions

  • Olliver Collmann, Partner at AVEGA Luxembourg - Portrait

    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 at AVEGA Luxembourg - Portrait

    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 at AVEGA Luxembourg - Portrait

    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.

Tax Compliance

  • Tobias Wieczorek

    Partner

    your expert for tax compliance

    • Corporate & International Taxation
    • International Tax Planning Projects

    Tobias is a Tax Partner at Avega Tax Advisors S.à r.l., a role he assumed in 2021 after joining the firm in 2020. He is a national tax adviser with over 20 years of professional experience in Luxembourg. Within Avega Tax, he focuses on tax compliance services across all tax types in Luxembourg and is recognized for his strong technical expertise and hands-on approach in managing complex compliance matters.
    Prior to joining Avega, Tobias began his career in Luxembourg in 2004 with leading international professional services firms. He has extensive experience in corporate and international taxation, cross-border tax planning, and reorganizations, advising multinationals, investment funds, and private equity firms, and has been involved in major international tax planning projects for Private Equity and Real Estate funds as well as European, US, and Asian multinational groups.

  • David Stalker, Partner at AVEGA Luxembourg - Portrait

    David Stalker

    Partner

    your expert for tax compliance

    • International & Luxembourg Taxation
    • Pillar 2 Compliance

    David is a Tax Partner at Avega Tax Advisors S.à r.l. since joining the firm in 2024. He is a seasoned professional with over 16 years of experience in international and domestic tax matters, advising multinational groups, private equity investors, and family offices on EU regulations, as well as international and Luxembourg taxation. At Avega Tax, David provides tax compliance services to corporations and funds across their entire lifecycle, from incorporation to liquidation, ensuring timely filings and high-quality deliverables. He also serves as the firm’s lead expert on Pillar 2 compliance. Prior to joining Avega, David worked at Big 4 firms, where he led major cross-border tax projects and gained extensive experience in managing complex, multi-jurisdictional tax issues, guiding organizations through complexity with a focus on practical and efficient tax solutions.

  • Carine Visin, Partner at AVEGA Luxembourg - Portrait

    Carine Visin

    Partner

    your expert for VAT compliance services

    Carine is a Partner at Avega Tax Advisors S.à r.l., where she leads the VAT Compliance department. She is a VAT specialist with extensive experience in helping businesses manage their Value Added Tax obligations, ensuring accurate reporting, timely filings, and compliance with local regulations. Carine is recognized for her focus on high-quality deliverables and clear communication, which she considers essential to the success of every project.
    Within her team, she ensures alignment on goals, fosters collaboration, and promotes a culture of transparency and trust, enabling projects to be delivered on time, meet objectives, and satisfy stakeholder expectations. Prior to joining Avega, Carine gained technical and managerial expertise at PwC Luxembourg, equipping her with the skills required to lead complex VAT compliance matters effectively.