Team

Dr. Philipp Zinsmayer
Director Investment

Dr Philipp Zinsmayer received a PhD in Finance & Accounting at the University of St. Gallen (HSG). He also has a degree in Business and Engineering from the Karlsruhe Institute of Technology and a Master in Law from the Frankfurt School of Finance. Dr Philipp Zinsmayer has worked as a research assistant at HSG and as a business consultant for Bayer AG & ZF Friedrichshafen. He worked in the M&A department at Robert W. Baird & Co. and as chief of staff at the Internetstores Group. Since 2019, he has been the director of investment at the KOEHLER GROUP and heads the KOEHLER real estate unit.

René Marius Köhler
Founder

René Marius Köhler has been part of the international tech community since 2003 and has in-depth, detailed knowledge of the relevant companies and their technologies. At the age of 20, he founded “fahrrad.de” and the “Internetstores Group”, which he ran as CEO until 2016, and was one of the most successful founders in Germany. Since 2008, he has made investments in technology companies, private equity funds and begun building up a real estate portfolio. In 2016 René Marius Köhler founded the KOEHLER GROUP, an entrepreneurial family office with an investment focus on technology companies and digital business models.

Stephan Belser
Director Investment Solutions

Stephan Belser joined the KOEHLER GROUP in November 2022. He was previously responsible for the professional leadership of the wealth management division at HypoVereinsbank in Stuttgart. Thanks to his extensive experience as asset and portfolio manager at Vermögen-Management BC GmbH, he has in-depth knowledge of providing fund assets advice for private and institutional customers, as well as planning and managing individual mandates for wealthy private individuals, medium-sized companies, foundations and family offices. After graduating in Business Management, Stephan Belser completed a Masters in Banking & Financial Management in Liechtenstein, where he was presented with the Liechtenstein Bankers Association Award. He also completed a part-time MFTA for which he received the John Brooks Memorial Award. He has more than 22 years of capital markets experience. He is responsible for the portfolio management of the KOEHLER Equities share fund and designs investment solutions in all asset classes.

Regina Tag
Executive Assistant

Regina Tag supported the Internetstores Group in diverse functions between 2005 and 2017 and as an assistant to the CEO, where she attained a broad spectrum of competence and experience, while developing a solid network. Since 2017, she has been an executive assistant at KOEHLER GROUP Holding GmbH. In addition to supporting management in various areas, her core responsibilities include organisation, coordination and planning as well as real estate development and administration.

Sarah van Hauten
Executive Assistant

Before assuming her responsibilities at KOEHLER GROUP Holding GmbH, Sarah van Hauten spent seven years working as an assistant in various business units and as a consultant and employee in the back office of the Controlling department at a large regional bank. Since 2020, she has been an executive assistant at KOEHLER GROUP Holding GmbH and has supported the management in the back office, in real estate and in various divisions of the daily business.

Alexandra Bischoff
Executive Assistant

Alexandra Bischoff successfully completed her Bachelor in International Business Communication and gained extensive assistance and sales experience in real estate and online business models. Since 2017, she has been an executive assistant at KOEHLER GROUP Holding GmbH and has supported the management in the coordination and planning as well as in the back office, real estate and equities.

Krystian Fiedler
Facility Manager

For many years, Krystian Fiedler had various responsibilities at a company working throughout Europe in the recycling industry. Since 2017, he has been a facility manager at KOEHLER GROUP Holding GmbH. He handles residential and commercial properties and serves as the interface between owners, service providers and tenants. Furthermore, he is responsible for all the technical areas at KOEHLER GROUP Holding GmbH and leads diverse operational projects

Isabell Gottron
Acquisition Manager

Isabell Gottron is an office management assistant with additional qualifications as Consulting Assistant as well as Real Estate Consultant. Before joining KOEHLER GROUP Holding GmbH, she gained valuable experience as a project manager in the acquisition and sale of real estate as well as a transaction manager in the field of real estate purchasing. Parallel to her work as Acquisition Manager at KOEHLER GROUP Holding GmbH, she is continuing her education as a real estate specialist („Immobilienfachwirtin“).

David Fuchs
Business Development

David Fuchs studies international financial management at the Nürtingen-Geißlingen University of Applied Science for Economics and the Environment. As part of this degree programme, he completed an internship in business development at KOEHLER GROUP Holding GmbH. Since 2021, he has been writing his Bachelor’s thesis and working in business development at KOEHLER GROUP Holding GmbH, helping it with acquisition and coordination in real estate and in the investments sector.

Monika Gabrych-Milicevic
Accounting Officer

Monika Gabrych-Milicevic is an expert in finance and accounting. She has twenty years of experience as a tax clerk and before joining KOEHLER GROUP Holding GmbH, she worked as the head of the accounting department in a well-known southern German company. For the KOEHLER GROUP she takes over all measures of accounting in the real estate sector including rental and tax law issues as well as financial accounting. Furthermore, she is responsible for auditing in areas of accounting and sales tax issues as well as for the preparation of the annual financial statements of KOEHLER GROUP Holding GmbH.

Philipp Schlüren
CEO & Co-Founder JetApp GmbH

Philipp Schlüren, CEO and co-founder of JetApp GmbH, has dedicated himself to the private aviation industry since the beginning of his career. He has more than 10 years of experience in sales and management positions of an operator company (AOC). Furthermore,
Philipp Schlüren holds the highest commercial vehicle operator license and has additional qualifications as a flight tester and flight trainer, both for theory and in practice.

As CEO and co-founder of JetApp GmbH, Philipp Schlüren is responsible for the overall management of the company and focuses, in particular, on the further development of the product and sales.

Bernd Gottwick
Advisor Controlling & Finance

Bernd Gottwick passed the tax advisor exam at the age of 25 after studying business administration and was one of the youngest tax advisors in Germany. He is a tax advisor, specialist advisor and certified family officer (VuFO). After working for a medium-sized tax consulting and auditing firm for many years, he has run his own firm as an independent tax advisor since 2016 and mainly advises family-owned companies and private individuals with many (real estate) assets.

Since 2018 he has advised KOEHLER Group Holding GmbH and its subsidiaries in controlling, finance and private equity.