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real estate needs tailor made solutions

About us

As an independent financial advisor, we focus on providing customised solutions to meet the financial requirements of our clients. The team consists of specialists with decades of experience and expertise from various positions held with international investment banks and law firms.

The combination of our corporate finance, capital markets and structuring expertise as well as our in-depth understanding of real estate fundamentals and clients’ needs allows us to deliver on what we promise.

Our passion for innovative solutions is the most precious asset to outperform the industry standard. We work hard to establish and maintain a high responsive and focused relationship with our business partners.


billion EUR

real estate financing track record

team members

to structure and arrange the most efficient financing solutions

competence areas

corporate finance, capital markets, structuring, institutional client coverage

Aggregate Financial Services

We are a member of the Aggregate Group, founded to serve with excellence, innovation and team spirit.


Johannes Märklin

Managing Partner

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Johannes worked for 25 years in the German banking industry. He co-founded Aggregate Financial Services.

Previously he was running Deutsche Bank’s Private Debt Syndicate business for its Corporate Finance and Debt Capital Markets division with teams in Frankfurt, London, Singapore and Tokyo. In his roles, Johannes developed the financing activities for international corporate clients, including real estate companies and financial institutions and expanded the distribution activities of capital market products to institutional investors across Europe and Asia. Johannes holds a German diploma in Business Administration and a MBA from University of Wales.

Johannes is married and has 4 children.

Sebastian Ernst

Managing Partner

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Sebastian has over 18 years financial services industry experience. He co-founded Aggregate Financial Services in 2018.

Previously Sebastian was a Managing Director and Global Head of Illiquid Credit Trading at Deutsche Bank. He was responsible for the underwriting and structuring of financing transactions and the trading of illiquid bonds and loans with a focus on corporate and real estate related credit risk.

He holds a Masters degree in Business Administration from the University of Passau. Sebastian is married and has 3 children.

Peter Kuhne

Managing Director

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Peter Kuhne joined Aggregate Financial Services as Managing Director responsible for the back-, middle-office and control functions early 2020 and has nearly 20 years of work experience in the banking industry.

Before moving to Aggregate Financial Services he worked as Business Manager / COO for various international Corporate Coverage teams at Deutsche Bank.

In this role Peter Kuhne was responsible for the management and control of the operational processes of up to 450 sales and coverage people.

He studied business administration at the Johann-Wolfgang-Goethe University in Frankfurt and the Università Cattolica del Sacro Cuore in Milan and graduated with a diploma.

Peter Kuhne is married and has four daughters.

Nadja Hoppe

Corporate Finance

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Nadja has more than 8 years of corporate finance experience with a focus on debt advisory and real estate transactions. As Director in Aggregate’s corporate finance team, she is responsible for advising clients on structuring and arranging financing solutions.

Prior to joining Aggregate, Nadja advised and executed corporate finance and restructuring transactions at NAI Apollo, PricewaterhouseCoopers and Deutsche Bank.

Nadja earned a German Diploma in Economics from the Leibniz University of Hanover.

Steffen Rapp

Institutional Clients

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Steffen has more than 20 years experience in various roles and positions in the capital market sector. As Managing Director, he is responsible for the institutional clients coverage.

Prior to joining Aggregate Financial Services, Steffen worked for Deutsche Bank and was there in several leading and specialist roles responsible for Capital Markets Risk Management Solutions especially for corporates in the EMEA region. The last years Steffen was active as a Managing Partner in building up a niche company in the construction sector. Additionally he helped especially start ups in fund raising rounds.

Steffen has a broad network of people active in a wide range of industries.

He is married and has 2 children.

Johannes Kaiser

Client Coverage

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Johannes is responsible for institutional client coverage and in charge of new technologies and tools for Aggregate Financial Services. Prior to joining Aggregate, Johannes worked for 10 years in the capital markets divisions of Deutsche Bank and Macquarie Group where he focused on the coverage of institutional and corporate clients. Preceding his career in the financial industry, Johannes was a professional cyclist.

Johannes completed his studies of Engineering and Economics and owns a diploma in Industrial Engineering from the Technical University of Ilmenau.

Michael Rützel

General Counsel

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Michael heads the legal department of Aggregate. Before joining, he worked for 15 years with White & Case, Barclays Capital and Deutsche Bank in various capital markets, regulatory and structured finance teams where he focused on real estate financing and securitizations for banks and private equity companies.

Michael is admitted as a German lawyer and as a solicitor in England and Wales. He is a regular lecturer at the German Graduate School of Management and Law on Legal Tech and Project and Process Management and a speaker at industry events.

Matthias Sandfort

Banking Coverage

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Matthias has more than 20 years experience in various roles and positions in the real estate market. As Managing Director, he is responsible for banking coverage.

Prior to joining Aggregate Financial Services, Matthias worked for NATIXIS, Helaba and WestLB. During his 6 years as department head for international real estate restructuring (US, UK and European portfolios) at Helaba, he gained significant experiences in turnaround, restructuring and operational / performance improvement consulting. Previously, Matthias focussed on real estate lending in Central and Eastern Europe and as Head of Western Europe. Matthias is married and has 3 children.

Benjamin Uhde

Corporate Finance

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Benjamin is Executive Director in Aggregate’s corporate finance team and responsible for advising clients in real estate financing solutions. He has 13 years of corporate finance, capital markets and private equity experience where he worked as corporate finance advisor, real estate sector banker and as senior financial analyst for a publicly listed real estate company.

His transactional experience comprises of equity and debt capital markets transactions, private equity and debt, structuring, arranging and placement of senior and junior loans for developments as well as real estate portfolio in Germany, Austria, Switzerland, the Nordics and South East Europe. Benjamin has graduated with Master of Arts in Finance. He is fluent in German, English, French, Italian and Spanish. Benjamin is married and has 2 children.

Martin Bielefeld


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Martin has joined Aggregate Financial Services GmbH in 2019. He is responsible for structuring financial solutions. He previously worked for Deutsche Bank’s Private Debt Syndicate. Before joining Deutsche Bank in 2006, Martin has worked for Morgan Stanley in London and Clifford Chance in Frankfurt and London. Martin is a qualified lawyer in Germany and a solicitor of England and Wales.

Till Wenke

Corporate Finance

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Till has 12 years of real estate finance experience.

Prior to joining Aggregate Financial Services, he worked for Eurohypo and Hamburg Commercial Bank in various roles. He has significant experience in structuring of financial solutions, debt capital markets and distressed debt.

His transaction experience comprises of structuring of development financings, customised investment loans, international restructurings, arranging of promissory note loans and securitisations.

Till holds a diploma in Business Administration and has one child.

Christian Kummer

Client Coverage

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Christian Kummer is employed as an Associate. He supports the team in all lines of business. Before he joined AFS he worked for a project and property development company and as an advisor for commercial real estate financing.

Christian Kummer holds a Masters degree in Business Administration – Banking & Finance.

Raphael Pasiek


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Raphael has joined Aggregate Financial Services GmbH in 2020. He is responsible for product development and structuring. He previously worked for Société Générale’s Legal Department in Frankfurt.

Before joining Société Générale in 2015, Raphael has worked for Morgan Stanley, The Royal Bank of Scotland, Barclays in London, Landesbank Berlin in Berlin, UniCredit in Munich as well as Clifford Chance in Frankfurt and London, SJ Berwin in Berlin and Frankfurt, Dewey & LeBoeuf in Frankfurt and King & Wood Mallesons in Frankfurt.

Raphael is a qualified lawyer in Germany.

Thomas Waldhart-Knopp


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In the Spring of 2020 Thomas Waldhart-Knopp joined Aggregate Financial Services as Compliance officer. He has more that 20 years of work experience in the financial industry.

Before moving to Aggregate Financial Services he worked as Head of Regulatory Compliance for Morgan Stanley Europe SE. Prior to this Thomas worked in various regulatory and regulatory change related positions at Deutsche Bank.
In this roles Thomas was inter alia responsible for the implementation of effective procedures for complying with the legal rules and regulations.

He studied business administration at the University of Applied Sciences Berlin and HELIA Helsinki Business Polytechnic in Helsinki and graduated with a diploma (FH).

Thomas Waldhart-Knopp is married.

Dirk Giessamer

Technology & Operations

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Dirk joined Aggregate Financial Services as Head of Technology & Operations at the beginning of 2020. He has more than 15 years of experience in the IT sector and the financial industry, founding his first Web-Agency back in 1998.

Before moving to Aggregate Financial Services he worked in several positions at Deutsche Bank, starting in Group Technology & Operations to latest being the responsible COO for the Financing & Solutions Group in the D/A/CH region of the Corporate Bank division.

Dirk studied at the Frankfurt School of Finance & Management and Victoria University of Wellington New Zealand and holds a Master degree in Banking.

Dirk is married and has two children.

Nicholette Fung

Office Manager

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