BITZERmainfort
About us

Team

We know the other side: many of us spent years investigating and auditing ourselves. Today we work for our clients in Odenthal near Cologne and in Frankfurt am Main.

Markus Bitzer

Markus Bitzer

Managing DirectorDiplom-Finanzwirt (FH/Zoll)

22 years of experience in customs, 17 of them with the German customs administration and 15 with the Customs Investigation Service (Zollfahndung) in various areas of investigation. Since 2021 he has advised companies, law firms and tax advisers on customs law and export control. Regular speaker and lecturer.

Profile →
Heiner Neuhaus

Heiner Neuhaus

Managing DirectorRechtsanwalt (German lawyer)

Rechtsanwalt and managing director at mainfort Rechtsanwälte in Frankfurt am Main since 2010, and also at BITZER MAINFORT since 2024. His main areas are tax compliance, tax criminal law, and commercial and company law.

Profile →
Werner Wingender

Werner Wingender

Managing DirectorSteuerberater (German tax adviser)Diplom-Finanzwirt

Former tax investigator with 49 years of professional experience in the tax administration in tax law and tax criminal law, 19 of them with the tax investigation service in Bonn (Steuerfahndung Bonn).

Profile →
Frank Mateus

Frank Mateus

Senior ManagerCustoms and export control

Former customs officer who moved into industry. For more than 20 years responsible for export control, customs processes and audits in internationally operating companies, most recently at a German manufacturer of IT security and telecommunications technology.

Profile →
Kyra Thelen

Kyra Thelen, LL.B.

Consultant for customs and export control law

Studied law at Ruhr-Universität Bochum. Her main areas are customs law, foreign trade law, export control and the analysis of criminal case files.

Profile →
Doris Gruchey

Doris Gruchey

SpecialistCustoms and excise duties

More than 35 years of experience with customs and excise duties in industry, 21 of them in the tobacco industry and 15 as head of customs controlling and risk management at Bayer Business Services. Her main areas are customs value, special procedures and excise duties.

Profile →
Behind the team

We are supported by further staff in the back office – professionals with experience in various areas of law. For legal questions outside our core areas, we work with the lawyers (Rechtsanwälte) of our sister firm mainfort in Frankfurt am Main.

Network

Our sister firm mainfort Rechtsanwaltsgesellschaft Steuerberatungsgesellschaft mbH in Frankfurt am Main is affiliated with the international network Moore Global. Through it, we work with firms of this network on cross-border matters. For questions with a US connection, we are supported by RS Mainfort & Associates LLC in Miami.

For tax and law firms

We also support other advisers: with specialist input, an expert assessment or hands-on support on a matter, where it touches on customs, export control or tax criminal law. The client relationship remains with you.