Mirella Mayer
Hamburg
Summary
Investment and fund manager specialising in energy transition and infrastructure investments. Responsible for the full investment process, from origination and analysis through structuring and financing to fund and asset management. Built investment pipelines in renewables, digital infrastructure and maritime assets, establishing a robust international network of institutional investors. Leads a fund and investment team and presents investment, financing and structuring decisions to management and shareholders. Entrepreneurial experience combined with financial and legal expertise.
Overview
4
4
Languages
8
8
years of professional experience
Work History
Fund & Investment Manager
Hamburgische Seehandlung & Hamburgische Energiehandlung
Hamburg
01.2024 - Current
- Built an investment pipeline in renewables and digital infrastructure — 358 MW solar and BESS, 300 MW data centres — and a maritime pipeline of EUR 150m; established a network of developers and industrial partners to enhance investment opportunities.
- Independently led infrastructure, energy and maritime investments across the full investment process — investment analysis, due diligence, financial modelling, investment papers, negotiations and financing; developed cross-border fund and financing structures across Switzerland, Poland, Italy and Luxembourg.
- Managed 10 fund vehicles representing EUR 170m in total investment volume — liquidity management, financings, distributions, reporting and annual accounts; managed banks, advisors and investors. Restructured the solar fund, reducing ongoing fund costs by 60%; averted a fund insolvency through a refinancing structured and executed within seven days, generating a EUR 500k gain; increased the distribution rate to 12%.
- Led a team of five in fund and investment management; prepared and independently presented all investment, financing and structuring decisions to management and shareholders.
- Built and independently owned the institutional fundraising function; developed an international network of institutional investors and family offices across Europe, the US, Asia and the Middle East; direct outreach without placement agents and targeted asset-investor matching by investment strategy, risk and return profile.
- Developed the corporate strategy and implementation roadmap at shareholder level to evolve the business into an institutional infrastructure investment platform; repositioned market presence and investor communications; digitalisation and AI automation of fund and corporate processes; designed the concept for an AI-powered energy platform.
Co-Founder & Managing Director
Mayer & Winkler Vermögensverwaltung GbR
Hamburg
09.2021 - Current
- Full ownership of a private real estate and equity holdings portfolio: investment strategy, portfolio monitoring, performance analysis and asset management with a focus on cash flows and value creation.
- Appraisal of new investment opportunities, due diligence, price negotiations and management of the acquisition process through to completion.
- Structuring and negotiation of financings, ongoing management of debt facilities, and relationships with lending banks.
- Budgeting, liquidity planning, budget-versus-actual analysis, accounting, contracts and tax matters.
Tax & Transaction Advisory
BDO AG Wirtschaftsprüfungsgesellschaft
Hamburg
10.2022 - 02.2023
- Designed and implemented national and cross-border reorganisations for corporate and group clients, including mergers, conversions, and demergers, while conducting M&A and tax due diligence to ensure compliance and optimise tax positions.
- Prepared corporate and reorganisation agreements, tax memoranda, tax returns, and tax assessments, providing support in objection and appeal proceedings to safeguard client interests and ensure regulatory adherence.
- Collaborated with team members to achieve target results.
Legal Assistant
Fragel Law Firm
Hamburg
08.2018 - 05.2022
- Handled civil and corporate law matters, drafting and negotiating contracts, preparing pleadings, and supporting litigation; contributed to client acquisition and firm expansion.
Education
Diploma in Law - international law
Johannes Kepler University Linz
Austria12-2028
BSc Business Administration - Audit and Taxation
University of Hamburg
Germany03-2019
Law -
University of Vienna
Austria12-2013
Skills
- Investment: investment management and deal execution, financial modelling and valuation, investment structuring and project finance, M&A and due diligence
- Asset Classes: solar, BESS, wind, biogas/biomethane, hydrogen, digital infrastructure, maritime investments, real estate
- Funds & Portfolio: fund and portfolio management, asset management, value creation
- Leadership: team leadership, Stakeholder management, institutional fundraising
- Regulation & ESG: AIFMD, SFDR, EU Taxonomy, German fund and insurance investment regulation; corporate and tax law
- Technology: advanced Excel/VBA, HGB/IFRS reporting, generative AI, RAG and agent development
Languages
German
Proficient
C2
Croatian
Proficient
C2
English
Proficient
C2
Italian
Elementary
A2
Professional Development
- Financial Modeling & Valuation Analyst (FMVA), CFI, ongoing
- Financial Planning & Wealth Management Professional (FPWM), CFI, ongoing
- IBM RAG and Agentic AI, ongoing
- Artificial Intelligence in Finance and Wealth Management, University of Illinois, 2026
- Artificial Intelligence in Finance and Wealth Management, CFI, 2026
- Generative AI and Blockchain, INSEAD, 2026
- Leading People and Teams, University of Michigan, 2026
- Negotiating with Impact Investors, Duke University, 2026
- The Psychology of Negotiation, Yale University, 2026
- International Tax — Tax Beyond Boundaries, 2022
Timeline
Fund & Investment Manager
Hamburgische Seehandlung & Hamburgische Energiehandlung
01.2024 - Current
Tax & Transaction Advisory
BDO AG Wirtschaftsprüfungsgesellschaft
10.2022 - 02.2023
Co-Founder & Managing Director
Mayer & Winkler Vermögensverwaltung GbR
09.2021 - Current
Legal Assistant
Fragel Law Firm
08.2018 - 05.2022
Diploma in Law - international law
Johannes Kepler University Linz
BSc Business Administration - Audit and Taxation
University of Hamburg
Law -
University of Vienna