Thomas Joos · IT Consulting & Author
More than 100 books and thousands of publications on IT topics, security, AI, cloud and networks. Plus numerous documentations for various companies.
International
Part of my work appears in English. I write for editorial teams in the United States and in France, most recently for Communications of the ACM, for ADMIN Magazine and for the InCyber Forum.
Communications of the ACM
The first large-scale measurement of post-quantum TLS on the open internet. About half of the busiest websites now negotiate a quantum-resistant key exchange by default. The predicted latency penalty does not materialise.
Read the article
Hands-on articles for administrators, most recently on Microsoft Defender for Endpoint, on Synology and QNAP storage systems and on the File Server Resource Manager.
More than thirty articles for the European cybersecurity portal of the Paris-based group FORWARD Global, most recently on sovereign cloud.
For almost 30 years I have been writing technical books for the publishers Microsoft Press, Addison-Wesley, O'Reilly, dpunkt, Rheinwerk, Springer Vieweg and Markt und Technik. My books cover topics such as Microsoft Windows Server, Microsoft Exchange Server, cloud architectures and enterprise solutions.
I develop the questions myself, conduct the conversations myself and turn them into independent specialist articles for the German and international trade press. Companies supply no finished material. The choice of questions and the assessment stay journalistic.
I host podcast episodes for trade media and talk to decision makers driving digital transformation in large corporations and mid-sized companies. The questions come out of my own research.
Recording takes place in the studio or on site at the event. Each conversation then becomes a separate article of mine.
Product and AI strategy at Google Cloud and the agentic enterprise platform.
Digital sovereignty and a sovereign cloud for the DACH region.
Cloud security, exposure management and securing AI-generated code.
Continuous Threat Exposure Management and Attack Surface Management in the cloud.
The sovereign European cloud from the provider's perspective.
The analyst's view of the European cloud market and digital sovereignty.
Security belongs inside the network itself. Recorded at Digital X 2026 in Cologne.
On site at the press roundtable „Agentic Enterprise in DACH". The conversations and sessions turned into a series of articles, among them the Gemini Enterprise Agent Platform, the collaboration of AI agents via A2A, ADK and MCP, and the AI Agent Marketplace.
Further conversations took place with Rolf Schumann (Schwarz Digits) and Markus Schuster (Procilon). Digital sovereignty runs both ways. InCyber News interviewed me as an expert on the European cloud market.
Podcast
Besides writing I host the Insider Research series. These are the current episodes.
Watch the episodeInsider Research
Live from Digital X 2026 in Cologne
Networks and security belong together. The conversation covers what companies have to protect once AI systems work inside the network.
with Dr. Niklas Horstmann, COO Telekom SecurityHost Thomas Joos
Watch the episode
Watch the episodeInsider Research
Security, responsibility and liability in the age of autonomous AI systems
Who is liable when an AI agent acts on its own? The conversation separates technical safeguards from legal responsibility.
with Felix Blanke, SentinelOneHost Thomas Joos
Watch the episode
Watch the episodeInsider Research
New risks, new security strategies
Agentic AI shifts the attack surface. The conversation names the new risks and the countermeasures that already work today.
with Andreas Fuchs, DriveLockHost Thomas Joos
Watch the episode„The book "Windows Server 2022" is one of the most comprehensive Windows Server books on the market. Thomas Joos, a leading authority in this field, delivers another instructive and informative title that can be used as a reference work by beginners as well as experienced Windows Server administrators."
„Quite simply THE PERFECT book on its subject. Not a word too many, not one too few. I work in IT professionally, and the current edition of this book has been on my shelf for years. In my opinion, THE STANDARD REFERENCE on this topic."
„I am happy to pass on the feedback from One Identity PR, the senior marketing manager and above all the EMEA Field Marketing team, which uses the publications Europe-wide. Everyone is thrilled with the contributions, especially the latest strategic article that just appeared on Security-Insider."
„The approval for your specialist article for our client Kontron has now reached us. Many thanks for the pleasant collaboration! We look forward to the next article assignment with you."
„You produced excellent practice-oriented articles for us on Kontron in the retail sector, as Jan Lauer reported to me – pieces that were even partly placed via you."
„The Kontron piece is exactly the right format for us."
„Many thanks for the great interview last week! We are delighted that you will turn it into an interview piece."
„Peter Schmitz, Editor-in-Chief at Security-Insider, likes the texts – no changes needed. Thanks for handling it so quickly."
„Well done – thanks for the excellent work!"
„A big thank you for your excellent work."
„A truly excellent lead article on metasurfaces. Engaging topic, concise presentation of the studies."
„You can tell you engaged deeply with the topic – a strong piece of writing."
„I have already received really good feedback internally. Peter is enthusiastic about the title and management is too."
„The article on SR Linux is excellent."
„I got in touch with you through my colleague, who already works with you and recommended you to me warmly."
„I really like your new topic suggestions."
„Fantastic! The article looks excellent. Many thanks for the timely submission."
„Great article on Updowntool!"
„A polished and engaging article on data protection in Google Gemini."
„Many thanks for the great webinar. There were many participants with an average attendance time of 32 minutes. Interest was high, and the questions and feedback were very engaging."
„I always read your iX articles with great benefit – the Proxmox pieces have stuck with me in particular."
„I read the Security-Insider news regularly. The Patch-Tuesday summary is informative, alarming and reassuring at the same time. The information is correct and important, and the summary is simply brilliant."
„Thank you so much for the help in resetting my PC after that destructive update. Games no longer worked at all. Not a single one! Now it works again and I am extremely happy."
„Compliments on your tips, highly recommended!"
„Looks great."
In addition to my regular technical texts, I publish commissioned work for numerous agencies, companies and publishers. These are mostly specific, in-depth deep dives, whitepapers, analyses or ebooks.
For more than 30 years I have written and tested for the leading IT trade media, publishers, vendors and communications agencies in the German-speaking world.
Focus area
Since 2024 I have been writing regularly about Proxmox VE, about moving away from VMware and about cluster operation. The articles appear in WindowsPro, Security-Insider and IP-Insider.
The press page In the News carries three of my IP-Insider articles, each naming me as the author.
Secure Boot, SSH, realms, ACLs, firewall, containers and clusters in three parts that build on each other.
Step-by-step guides for administrators, from network bonding to restoring a host.
„I always read your iX articles with great benefit – the Proxmox pieces have stuck with me in particular.“
More than 100 books and thousands of publications on IT topics, security, AI, cloud and networks. Plus numerous documentations for various companies.
Articles for c't, iX and heise online.
Guides, tests and hands-on articles on PC and technology.
In-depth expertise and news on IT security.
Expert contributions on IIoT and Industry 4.0.
Resources and tutorials for IT administrators.
Knowledge on data centres and IT infrastructure.
Analyses and reports on enterprise IT and cloud solutions.
Articles on data analysis and big data.
Practical knowledge for Windows Server and administration.
Trends and strategies for the IT market and business IT.
Updates on network technology and infrastructure.
IT strategy and management know-how.
Articles and reports on IT management and digitalisation.
Articles on storage technologies and data management.
Trends, strategies and practical know-how on cloud technologies.
Tests and analyses in IT security and endpoint management.
Strategic IT topics, CIO perspective and management insights.
Practical know-how and tutorials for IT administrators in companies.
Articles on digitalisation in public authorities and the public sector.
Practice-oriented articles on GDPR, data protection and compliance.
International technical publications on Linux, open source and IT infrastructure.
International magazine for system administration and enterprise IT.
International articles on PC, hardware and software topics.
International articles on cybersecurity, threat landscape and IT resilience.
Articles in Germany's leading trade journal for information security, covering threats, security management, network security and compliance.
Articles for the practitioner portal of WEKA Intelligence, covering the DIN VDE 0100 standards, German energy law and artificial intelligence in electrical engineering.
Articles on electronics and embedded systems, covering quantum computing, forensic analysis and network attacks on industrial technology.
Practical articles on macOS, iPhone, iPad and Apple security in enterprise contexts.
In-depth articles on Apple platforms, local AI and Mac integration in enterprise IT.
In-depth practical articles on Active Directory, Entra ID, Microsoft 365 and Identity Access Management.
A selection of publishers and media houses with which I work regularly and successfully.
All my books and publications on Amazon
Reviews and ratings of my handbooks
My current bestsellers and new releases
I invite you to browse my complete bibliography on Amazon.
