About Us

About Us

About Us

Contact & Service

Mon - Fri 8:30 am to 5:30 pm
Tel: +49 721 48 08 48-680

Lindenbaum GmbH stands for

Secure conferences

Events and webinars

Tailored solutions

Skilled service


Lindenbaum GmbH from Karlsruhe has been developing its own conference solutions since 1999 and operates them for its customers in the Lindenbaum cloud.

In 2006 we received the innovation prize from the Initiative Mittelstand for our audio conference system with integrated application sharing (web meetings).

We use interfaces (REST APIs) to allow our customers to integrate our conference services in their own applications. You will receive support and customer service directly from Lindenbaum.

Customers of our conferencing cloud include SMEs in Europe from all industry sectors as well as globally active financial services providers and companies with production sites in several countries.

Telecommunications services

Lindenbaum is registered with the Federal Network Agency as a provider of telecommunications services and meets the corresponding legal requirements. You can download the directory The directory can be downloaded here.

Via interfaces (REST APIs) we offer our customers the integration of conference services into their own applications. Support and service in the customer care you receive directly from Lindenbaum.

Our conferencing cloud clients include SMEs in Europe across all industries, as well as global financial service providers or companies with production sites in multiple countries

Maarten Kronenburg – CEO

Maarten Kronenburg is Managing Director of Lindenbaum GmbH.

At the end of 2018, Maarten Kronenburg took over the management of Lindenbaum in order to step up international growth in the area of ​​communication technology platforms.

Prior to Lindenbaum, Mr. Kronenburg has had various international Commercial- and Directorship functions in his 25 years of professional experience. Working mostly for North American and German companies, Mr. Kronenburg’s experience ranges from service providers to IT resellers in Europe and North America.

Mr. Kronenburg is married with 3 children, he is an active sportsman and is a Master graduate of Groningen University. He has successfully completed various post-doctorate courses on a wide range of business topics such as Legal- and Logistics subjects.

Dr. Ralf Nikolai – CTO

Dr. Ralf Nikolai is CTO responsible for the development and operation of the platforms and systems.

Since 1999, Dr. Ralf Nikolai built and managed Lindenbaum until 2009 as a business unit Communications of disy Informationssysteme GmbH. During this time, Lindenbaum has become the European technology leader for conference platforms and has been able to win renowned telecommunications companies in Europe as customers.

Dr. Ralf Nikolai studied Computer Science at the University of Karlsruhe (Dipl.-Inform.) and worked at the Research Center for Computer Science (FZI), where he was responsible for the database systems research area. At the end of 2002, he successfully completed his doctorate at the University of Karlsruhe.