QUANTUM combines tax expertise and quantitative-economic know-how to offering you one-stop transfer pricing solutions. We are your advisors at QUANTUM.


Dr. Stefan Stein 

Stefan is a tax advisor with a specialization in international tax law. He has advised listed as well as medium-sized multinational firms during his time in the transfer pricing department of a Big-4 consultancy. For more than 9 years, Stefan has been dealing with transfer pricing and permanent establishments topics in science and advisory. He has expertise in the planning, implementation, documentation and defense of transfer pricing structures as well as in advising on intangible asset and permanent establishment topics, with a focus on the Automotive and Heavy Industry.

Stefan is author of German and English-language book chapters and publishes regularly articles on transfer pricing and permanent establishment topics in national and international journals. He is also a regular speaker on transfer pricing topics.


Prof. Dr. Christian Schwarz 

As quantitative-economist, Christian has been dealing with transfer prices for more than 7 years. In the transfer pricing department of a Big-4 consultancy, he advised listed and medium-sized firms on quantitative transfer pricing topics with an emphasis on model-based transfer pricing analyses, valuations and benchmark analyses. Christian has also significant experience in structuring and documenting transfer pricing structures with a focus on the fields of pharmaceuticals, biotechnology and retail.

Christian is a professor for quantitative methods and business models at the Düsseldorf University of Applied Sciences and actively represents the research field of quantitative methods and data analytics in the area of transfer pricing. He is the author of German and English-language book chapters and publishes regularly articles on transfer pricing and permanent establishment topics in national and international journals.