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Our Team

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Marie-Avril Roux Steinkühler LL.M.

Certified Lawyer in intellectual property and new technologies law

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Marie-Avril Roux is a seasoned IP lawyer with more than 20 years of experience in business and intellectual property, with focus on copyright, entertainment, media, new technologies and trademarks. After 15 years practice in Paris, she is now based in Berlin and further advises or litigate for her clients in France and Germany.

Her particularity: a specialized bi- and international IP practice in three languages, French, English and German.

Marie-Avril has been practicing in all areas of copyright and entertainment Law: publishing, music, cinema, television, radio, live performance, advertising, art, counterfeiting, plagiarism, sponsorship, patronage, privacy, image, advising producers, publishers, authors, artists and celebrities. She litigates in France and also in Germany. Her practice also includes the representation of creators and artists and the management of their rights.

The other focus of her practice is trademark protection. She advises international companies on their brands and new technologies. She manages and develops trademark portfolios in more than 70 countries, in addition to designs and domain names. She advises, drafts and negotiates license agreements, coexistence etc., provides representation before the French trademark office INPI, the German trademark office DPMA, the EUIPO, and the Court of Justice of the European Union. She practices also in Data privacy Law.

Her clients are mainly involved in publishing, production, fashion, food industry, finance mainly, and she counsels several NGOs.

Since 2021, Marie-Avril has also been involved in a number of voluntary activities. As a founding member of French Tech Berlin, she helps and supports the development of startups in Germany. As an international lawyer, she has been appointed as a French Foreign Trade Advisor (CCE). She is also president of APPEAL-E (Association for the Promotion of the Practice of Lawyers Abroad). Finally, she accompanies the IRAFPA (Institute of Research and Action on Fraud and Plagiarism in Academia) as a legal advisor.

She likes to support her clients in their projects and develop these projects with them, being flexible and inventive. Her first training at Sciences Po in commerce and finance, and then her experiences in mergers and acquisitions, gave her an operational approach and allowed her to support the establishment of French companies' activities in Germany.

Foto: fotostudiocharlottenburg


Sebastian Sycha LL.M.
Of Counsel

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Sebastian studied law at the FAU Erlangen-Nuremberg and started working in 2011  in an intellectual property-oriented law firm in Bavaria. In his capacity as clerk of the Higher Regional Court of Nuremberg, he concentrated on commercial law and spent part of his work as a legal clerk in an intellectual property business in the USA. In addition, he deepened his knowledge in the Master's programme "Immaterialgüterrecht und Medienrecht" (LL.M.) at HU Berlin, which he successfully completed in 2019. Sebastian  also successfully completed the specialist courses "Urheber- und Medienrecht" (Copyright and Media Law)  and "Gewerblicher Rechtsschutz” (Intellectual Property).


Since his admission as a lawyer in 2014, Sebastian has been advising and representing clients in the fields of copyright and media law as well as intellectual property law, out of court and in court. His work focuses on copyright infringements, licensing agreements,  press and public relations law and competition law.


Sebastian speaks German, English and French. In the law firm MARS-IP Sebastian is available as a independent cooperation partner for cross-border legal issues.


Foto: Glasow, glasow Fotografie,

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Susanne Klingenberg

Office manager, translator

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After her international management studies including stays in France, the USA and Dubai and a thesis about Brand and Trademark Law in China, Susanne started her career in Sales in Dubai before returning to Berlin in 1999 and taking over the showroom of a fashion label with responsibility for the East German market.

Her interests shifting towards Controlling and Finance, she stepped in as Business Unit Operations Manager for a British project management company in Berlin in 2002, followed by a further reporting interface position in a project development company in 2007.

Susanne has been self-employed since 2009 in the field of company set-ups, process optimizations, administration and bookkeeping, contract management and translations. She joined MARS IP in 2016 with the responsibility of invoicing, bookkeeping preparations and general administration.

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