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The ‘ingenious partners’ at GEISTWERT act for clients hailing from the video game, streaming and social media sectors, assisting them with the protection of trade marks and copyrights and the licensing of software and protected images. The team, consisting of Constantin Kletzer, Juliane Messner, Max Mosing, Alexander Schnider and Rainer Schultes, is also tasked with the structuring of IT projects, including outsourcing, and handles data protection issues arising out of GDPR and international data transfers.

Testimonials

“We work with GEISTWERT on IP, IT and media transactions. They handle such matters perfectly, in my view better than any full-service firm because IP and technology-driven aspects are their core focus. We appreciate their partner-centred approach.“

‘Max Mosing is an exceptionally bright lawyer with a lot of academic knowledge. Juliane Messner is the transactional mastermind of the firm, with huge experience in IT-based transactions. Very strong!’

GEISTWERT‘s ’smart, pragmatic’ team acts for clients requiring assistance with the daily management of trademark and copyright portfolios across sectors ranging from food and beverages to electronics, carrying out registration assessments and overseeing licensing negotiations. On the contentious front, the practice pleads cases before the courts where trademark or copyright infringements are alleged and defends inventor’s remuneration claims brought by former employees. Comprising the team are copyright litigator Constantin Kletzer, IP transactions and licensing specialists Juliane Messner and Max Mosing, Alexander Schnider, who focuses on IP mandates in the gaming sector, and Rainer Schultes, who is the group’s patent litigation specialist.

Testimonials

“Constantin Kletzer: stellar IP lawyer (trademarks, patents, contracting, licensing etc.) with a lot of knowledge and creative solutions.

Max Mosing: fabulous trademark and IT lawyer. Surprising what he knows, but yet has a pragmatic approach.

Juliane Messner: the transactional mastermind of the firm.”

“I personally appreciate the expertise, the fast reactions and that their answers are always on point. The focus is always on our enterprise and our interests in an economical way. Additionally, they provide their ideas and thoughts proactively to support us with a high level of service.”

GEISTWERT’s data protection practice handles both contentious and non-contentious matters tied to GDPR, including those concerning international data transfers, while also advising clients on the data protection aspects of new customer portals, ensuring they meet the requisite standards under EU and Austrian law. The team, which consists of ‘phenomenal lawyer’ Juliane Messner, Max Mosing, Alexander Schnider, Rainer Schultes and Constantin Kletzer, acts for clients in regard to data processing and storage challenges and in conjunction with IT outsourcing and customer-facing projects. The practice is also able to advise clients in the event of a data breach, including handling the relevant liaisons with the Data Protection Authority and ensuing enforcement proceedings.

Testimonials

“In data privacy and data protection matters, GEISTWERT is the go-to firm in Austria. Depending on the project, several GEISTWERT partners work on one data protection project, which works extremely well and raises the result to the next level.”

“Juliane Messner is a phenomenal lawyer. She always manages to find the best solutions with ingenious ideas. Clients love her for it.“

What the Team is Known For
GEISTWERT is a well-known law firm offering an excellent IP practice comprising patent and trade mark-related advice, including portfolio management and licensing. The law firm boasts particular prowess in contentious trade mark matters, excelling in infringement, opposition and cancellation proceedings. The team attracts clients from various industries, including pharmaceutical, automotive, food and drink and technology.

Strengths
I have come to know GEISTWERT as a very pragmatic and competent team that can objectively and appropriately assess and process risks and potential.

GEISTWERT has deep expertise and provides to-the-point advice in an understandable way and language. Additionally, response times are extremely short.

GEISTWERT is the go-to IP law firm in Austria. It has a high level of expertise paired with a no-nonsense, pragmatic approach to solve problems. It understands our business inside out.

GEISTWERT offers excellent expertise and a professional and dedicated service. The team comprises specialised and experienced IP lawyers.

In any area that we need legal advice, GEISTWERT’s expertise seems highly profound and state of the art.

Work Highlights
GEISTWERT advised LEWITT on the management of its trade mark strategy, including trade mark applications and potential infringements of its trade marks by retailers across the EU.

Notable practitioners
Constantin Kletzer boasts a strong IP practice. He represents clients in trade mark disputes and further advises clients on non-contentious trade mark matters. He also assists with copyright issues, domain law and licence agreements.

I would suggest everyone works with Constantin Kletzer.

He understands the international world and our clients‘ needs.

Constantin Kletzer offers a high level of expertise paired with a bright mind and an openness to creative solutions.

Constantin Kletzer is a true advocate with a good business approach.

Constantin Kletzer works extremely quickly and you do not need long explanations from him. He is very effective and provides concentrated work.

Alexander Schnider boasts strong experience in IP mandates across the gaming, automotive and telecoms sectors. He advises clients on trade mark, licensing, patent and unfair competition mandates, as well as copyright issues.

Alexander Schnider has proven to be an expert in the workings of our business.

I would recommend Alexander Schnider to any individual or company looking for legal support in the gaming industry.

Max Mosing regularly handles a broad spectrum of IP mandates from licence agreements and rebranding to copyright and trade mark infringement and cancellation proceedings. He is particularly visible in the media, automotive and beverages sectors.

I am very satisfied with him and we share the same approach on matters.

Max Mosing answers all questions extremely quickly and gives us excellent advice in the international environment.

Rainer Schultes regularly advises clients from the automotive, pharmaceutical and technology sectors on a variety of IP mandates, including trade mark, patent and unfair competition claims. He additionally assists with international domain disputes.

What the Team is Known For
GEISTWERT is a boutique law firm offering dependable expertise in IT and related IP matters. The practice is noted for high-quality work in software contracts and game development. It additionally handles copyright and trade mark matters. GEISTWERT’s further areas of activity include data protection and regulatory advice for tech companies. It is often seen advising numerous clients in the media, entertainment and electronics industries. The team represents companies on both domestic and multi-jurisdictional matters.

Strengths
GEISTWERT always advises with an eye for the big picture. One of the team’s most important assets is its uncomplicated accessibility and incredible response times.

The team stands out due to its expertise, efficient communication, flexibility and customer orientation. The in-depth knowledge, especially in IT matters, enables precise and strategic advice.

We appreciate GEISTWERT’s combination of very pleasant, charismatic personalities and highly professional work and expertise.

GEISTWERT has the ability to formulate complex matters in a way that is understandable to us as customers. Our enquiries are always solved on time and to our fullest satisfaction.

The GEISTWERT team is super client-oriented and reliable. It performs above expectations and we are excited by its attitude to clients.

Work Highlights
GEISTWERT represented Red Bull Media House in regulatory proceedings initiated against ServusTV in relation to allegations of inaccurate and defamatory content.

Notable practitioners
Max Mosing advises clients from the entertainment and tech sectors on a range of IT matters, including development contracts, data protection and questions surrounding NFTs. He further assists with the launch of video gaming platforms and provides regulatory support for media companies.

Max Mosing provides solution-oriented thinking, as well as the ability to present complex issues in an understandable way.

Max Mosing is a strong litigator with charisma.

Max Mosing is very client-focused, bright and nice to work with.

Max Mosing delivers very quick and to-the-point solutions.

Also see:
TMT Information Technology: https://chambers.com/department/geistwert-tmt-information-technology-europe-7:560:24:1:22815100
TMT Data Protection: https://chambers.com/department/geistwert-tmt-data-protection-europe-7:2585:24:1:22815100
TMT Media: https://chambers.com/department/geistwert-tmt-media-europe-7:561:24:1:22815100

What the Team is Known For
GEISTWERT is a pre-eminent intellectual property boutique firm, often sought out by pharmaceutical companies to assist in patent and advertising litigation, trademark matters, unfair competition and licensing contracts. The team is also equipped to advise on regulatory questions in the medical device area.

Work Highlights
GEISTWERT represented Probi against Hexal in a trade mark revocation action.

Notable practitioners
Often lauded for his extensive experience in issues pertaining to intellectual property, Rainer Schultes is frequently mandated by pharmaceutical and medical device companies to handle regulatory and trade mark matters, as well as patent disputes.

What the Team is Known For

GEISTWERT is a well-known law firm offering an excellent IP practice comprising patent and trade mark-related advice, including portfolio management and licensing. The law firm boasts particular prowess in contentious trade mark matters, excelling in infringement, opposition and cancellation proceedings. The team attracts clients from various industries, including pharmaceutical, automotive, food and drink and technology.

Strengths

GEISTWERT is the go-to IP law firm in Austria. It has a high level of expertise paired with a no-nonsense, pragmatic approach to solve problems. It understands our business inside out.

In any area that we need legal advice, GEISTWERT’s expertise seems highly profound and state of the art.

GEISTWERT offers excellent expertise and a professional and dedicated service. The team comprises specialised and experienced IP lawyers.

GEISTWERT has deep expertise and provides to-the-point advice in an understandable way and language. Additionally, response times are extremely short.

I have come to know GEISTWERT as a very pragmatic and competent team that can objectively and appropriately assess and process risks and potential.

Work Highlights

GEISTWERT advised LEWITT on the management of its trade mark strategy, including trade mark applications and potential infringements of its trade marks by retailers across the EU.

Notable practitioners

Constantin Kletzer

Constantin Kletzer boasts a strong IP practice. He represents clients in trade mark disputes and further advises clients on non-contentious trade mark matters. He also assists with copyright issues, domain law and licence agreements.

He understands the international world and our clients‘ needs.

Constantin Kletzer offers a high level of expertise paired with a bright mind and an openness to creative solutions.

Constantin Kletzer works extremely quickly and you do not need long explanations from him. He is very effective and provides concentrated work.

Constantin Kletzer is a true advocate with a good business approach.

I would suggest everyone works with Constantin Kletzer.

Alexander Schnider

Alexander Schnider boasts strong experience in IP mandates across the gaming, automotive and telecoms sectors. He advises clients on trade mark, licensing, patent and unfair competition mandates, as well as copyright issues.

I would recommend Alexander Schnider to any individual or company looking for legal support in the gaming industry.

Alexander Schnider has proven to be an expert in the workings of our business.

Max Mosing

Max Mosing regularly handles a broad spectrum of IP mandates from licence agreements and rebranding to copyright and trade mark infringement and cancellation proceedings. He is particularly visible in the media, automotive and beverages sectors.

Max Mosing answers all questions extremely quickly and gives us excellent advice in the international environment.

I am very satisfied with him and we share the same approach on matters.

Rainer Schultes

Rainer Schultes regularly advises clients from the automotive, pharmaceutical and technology sectors on a variety of IP mandates, including trade mark, patent and unfair competition claims.

He additionally assists with international domain disputes.

Juliane Messner

Italian and Austrian-qualified Juliane Messner is well placed to assist with IP mandates involving both jurisdictions.

She advises prominent clients on trade mark questions, including complex infringement and opposition proceedings.

Her practice also encompasses licensing agreements and portfolio management.

Juliane Messner supported us excellently.

Juliane also is the only Austrian IP lawyer ranked as a Chambers Global IP (2025) „Foreign Law Expert“.

GEISTWERT is top of the class for patent litigation in Austria. Although domestic and international clients in the life sciences account for most of the workload, the practice is also approached by leading figures in the electronics and mechanics fields. Recently Constantin Kletzer, Rainer Schultes and Alexander Schnider have been representing Teletan in an infringement case regarding the patented authentication system on its online payment authorisation platform. “Constantin is one of the best IP lawyers in Austria. He has an incredible knowledge of patent matters, and he is both fast and reliable.” “Rainer is direct, clever and always prepared”; and “Alexander delivers rock-solid advice in a very enjoyable and educational manner”. Completing the line-up, Juliane Messner and Max Mosing effortlessly handle complex contracts. Together they have been working with IPAG, a Universities Austria project in which Austrian universities and companies created a set of model agreements to assist the effective transfer of knowledge and technology. Austrian universities and businesses collaborate to create standard contracts, which are then evaluated and commented on by legal professionals.

The ‘knowledgeable and experienced’ team at GEISTWERT, consisting of Constantin Kletzer, Juliane Messner, Max Mosing and Rainer Schultes covers the full range of IP matters, assisting both national and international clients with the management of their portfolios and filings, while frequently acting in disputes concerning infringements, cancellation and opposition proceedings. The practice also routinely advises on the transfer of IP rights tied to transactions, including conducting due diligence checks. The firm maintains a broad client base, with the food and beverage and automotive sectors driving a significant percentage of the firm’s work, in addition to its strong niche in the video game industry.

Testimonials:

‘I have been working with Constantin Kletzer for many years. He is always attentive to clients’ needs and is able to find practical and efficient solutions, especially when cases are complex.’

‘GEISTWERT offers a fast service for all questions relating to IP, the orientation is customer-friendly and pragmatic and the skills of the lawyers are completely convincing.’

‘Constantin Kletzer has a pragmatic approach to given issues, works in a results-oriented manner and finds creative solutions that go outside the box.’

GEISTWERT‘s all-partner team, consisting of Constantin Kletzer, Juliane Messner, Max Mosing, Alexander Schnider and Rainer Schultes, assists TMT clients, including social media and streaming giants, on a spectrum of IT and IP matters, and maintains a particularly strong presence in Austria’s video game industry, where it advises clients on matters ranging from copyrights to NFTs. The team supports clients engaged in IT upgrade and outsourcing projects and is also tasked with supporting transactions in the TMT market.

GEISTWERT‘s partner-only practice provides ‘extremely fast and efficient advice’ at the intersection of data protection and IP, handling international data transfers, IT projects and data protection aspects of corporate transactions. The team, consisting of Constantin Kletzer, Juliane Messner, Max Mosing, Alexander Schnider and Rainer Schultes, also acts for clients facing hearings before the Austrian data protection authority and the courts, assisting with issues concerning user data disclosure requests and GDPR matters. The firm’s client base is comprised of companies ranging from digital media and pharmaceuticals to leisure and public bodies, whom it also advises on digital projects and initiatives including the launch of new customer programmes and services.

Testimonials:

Excellent market knowledge of the sectors that are important to us, such as EdTech, IP law, pharmaceutical law, corporate law bundled in one law firm, solving problems in a client-oriented manner and providing extremely fast and efficient advice.’

‘Juliane Messner has the best knowledge of corporate law. So important for us because we are internationally established. Max Mosing provides us with solution-oriented support in the volatile environment of data protection law. Rainer Schultes is our trusted pharmaceutical law specialist.’

‘Juliane Messner and Max Mosing are hands-on, knowledgeable and understand the business of their clients. They are stand-out lawyers in the market and always give clients the feeling that their matters are in good hands.’

GEISTWERT is a well-known law firm offering an excellent IP practice comprising patent and trade mark-related advice, including portfolio management and licensing. The law firm boasts particular prowess in contentious trade mark matters, excelling in infringement, opposition and cancellation proceedings. The team attracts clients from various industries, including gaming, automotive, food and drink and technology.

„The team is highly specialised and has deep knowledge.“

„The lawyers offer quick responses, a solution-oriented approach and information in a language that is understandable for non-lawyers.“

„The GEISTWERT team has a good understanding of complex issues and is strategically minded.“

„The lawyers are super quick, easy to understand and anticipate follow-up questions.“

„GEISTWERT provides a good assessment of the situation and is business-fluent and goal-oriented.“

Constantin Kletzer boasts a strong IP practice. He represents clients in trade mark disputes and further advises clients on non-contentious trade mark matters. He also assists with copyright issues, domain law and licence agreements. „It is a pleasure working with Constantin Kletzer. He is very pragmatic and solution-oriented.“ „The response time is fast and at the same time he is competent, solution-oriented and aligned with the economic interest of the company. We are pleased to have Constantin Kletzer on board and do not want to do without him.“ „Constantin Kletzer shows prudence, pragmatism and a goal-oriented approach.“ „He is very smart, always available and commercially minded.“ „Constantin Kletzer has a very hands-on approach but can also work with the appropriate depth when necessary.“

Alexander Schnider boasts strong experience in IP mandates across the gaming, automotive and telecoms sectors. He advises clients on trade mark, licensing, patent and unfair competition mandates, as well as copyright issues. „He is easy, straightforward and his expertise is up to date.“ „Alexander Schnider is very efficient and competent, always paying attention to detail and looking at a matter from all possible perspectives.“ „He is a very good trade mark lawyer.“ „Alexander Schnider is super responsive, super fast and has good turnaround times. He helps us from a business perspective and has so much experience with bigger businesses that he can tell us what might not be a good deal.“ „He guided us through the case very well, was always available for our worries and concerns and also summarised the judgments well in clear language.“

Max Mosing regularly handles a broad spectrum of IP mandates from licence agreements and rebranding to copyright and trade mark infringement and cancellation proceedings. He is particularly visible in the media, automotive and beverages sectors. „Max Mosing is very open to innovation and provides very good strategies.“ „Max Mosing is very precise and very much to the point. In terms of advice, he is very reliable.“ „The cool composure with which Max Mosing handles complex matters and navigates difficult situations does not cease to astonish me.“ „He is very down to earth and provides good-quality work.“

Rainer Schultes regularly advises clients from the automotive, pharmaceutical and technology sectors on a variety of IP mandates, including trade mark, patent and unfair competition claims. He additionally assists with international domain disputes. „Rainer Schultes is a strong performer.“ „He is very strong in patent litigation and unfair competition cases.“

Italian and Austrian-qualified Juliane Messner is well placed to assist with IP mandates involving both jurisdictions. She advises prominent clients on trade mark questions, including complex infringement and opposition proceedings. Her practice also encompasses licensing agreements and portfolio management. „She can get into the nitty-gritty of all the different types of companies and she understands them well.“

Juliane Messner also is the only Austrian lawyer who was ranked as Foreign Expert for Intellectual Property in Italy (https://chambers.com/legal-rankings/intellectual-property-foreign-expertise-austria-2:34:24:5).

“GEISTWERT’s service is always of excellent quality. All five partners not only have extremely deep knowledge of the specific fields they practice in but are also hands on and collaborative in a way that only benefits the client.” Alexander Schnider has a real entrepreneurial spirit and provides complete protection to gaming and media patrons. Alongside Rainer Schultes and Max Mosing, he has been advising Novomatic on all Austrian and EUIPO trademark matters. Schultes frequently emerges victorious from many skirmishes, while complex transactional instructions are bread and butter to Mosing. He works closely with Juliane Messner, and the duo receive warm plaudits from patrons: “Juliane and Max tailor their advice to the specific recommendations of our company and, due to their expertise, implement solutions that are highly customised and above all pragmatic. They always do an exceptional job and, on top of that, they are a pleasure to work with.” “When it comes to complex trademark litigation, Constantin Kletzer is the go-to attorney in Austria. He is a bright and deeply experienced lawyer with a keen sense for strategic solutions.”

As a firm, GEISTWERT received the following MIP IP Stars Firm Rankings 2023:

Patent disputes: Tier 1
Trade mark disputes: Tier 1
Copyright & related rights: Highly Recommended (only “highly recommended” and “recommended” available)
Trade mark prosecution: Tier 2

“Max has a superb knowledge of the law and how to apply it practically”, while “Juliane perfectly combines the world of IP law with transactions law – a unique talent, especially in international projects”.