Marcel has a distinguished record of advising top-tier clients from all industries - including listed companies (DAX & Fortune 500), private-Equity firms, family-owned companies, governments and NGOs - through complex transformation projects, post-merger integrations, operational carve-outs, and market-entry strategies across Europe, US, Asia, and South America.
Highlighting his high-impact work, Marcel was responsible for reshaping a Pan-European energy company’s approach to renewable energy, contributing to Europe’s green future by 2030 and setting up the first sustainable C-Position in a Dax company executive board.
Prior to joining Kroll, Marcel applied his expertise and passion as an Associate Director at KPMG Global Strategy Group. He also worked as a senior advisor for a leading German AI-company (Spin-off of the German Research Institute for Artificial Intelligence), as well as Project manager in the corporate development and chief of staff for a Member of the Executive Board at Deutsche Bank/ Postbank and Bertelsmann SE. After he work at the CIB – Corporate and Investment Banking at Deutsche Bank.
With a diligent approach and an eye for both the big picture and the intricate details, Marcel is passionate to find the right solution for our clients in a VUCA (Volatility, Uncertainty, Complexity, and Ambiguity) world in the domains of Transaction | Strategy | Transformation. and realizing the best possible solutions for them based on a trustful relationship.
Marcel holds a Ph.D. in macro-economics from HHL Leipzig Graduate School of Management / LSE - London School of Economics. He studied abroad at the Peking University PKU and the Griffith University in Australia. In addition, he holds a M.Sc. from Leeds University Business School and a B.Sc. from the Frankfurt School of Management. He is a member of the Beta Gamma Sigma Society honouring the top 5 percent of worldwide business school graduates)
In addition to that Marcel is a (co-)author of several books and articles as well as author at the DGAP: German Council on Foreign Relations / International Politics:
- Tiemann, M., (2020): Unternehmenskooperationen in disruptiven Zeiten - Erfolgsfaktoren für strategische Allianzen und Innovationsführerschaft, Schäffer-Poeschel, Stuttgart, ISBN-13: 9783791050577
- Tiemann, M., Kullik, J. (2019): Für eine europäische Rohstoffstrategie, Internationale Politik – Welt-spiegel, Deutsche Gesellschaft für Auswärtige Politik, Berlin
- Tiemann, M. (2012): Strategic Sovereign Wealth Fund (SWF) Investments as a possible solution in the war of resources, Cuvillier Verlag, Göttingen, ISBN-13: 978-3-95404-082-7
- Schalast, C., Tiemann, M.; Tuppi, P. (2009): Staatsfonds - „neue“ Akteure an den Finanzmärkten?, Working Paper der Frankfurt School of Finance and Management. Nr. 114, ISSN 1436975
Marcel is a lecturer at the ESB Business Reutlingen School and HHL Leipzig Graduate School of Management and is a qualified „Aufsichtsrat“ for Corporate Finance & ESG - Deutsche Börse AG.
