dr. R. Holz (Ralph)

I am a Full Professor at the University of Münster, and I also work part-time in the Design and Analysis of Communication Systems Group at the University of Twente.

Until 2019, I was a Lecturer in Networks and Security at the University of Sydney (that’s Asst. Prof. in other systems), Australia. Before that, I was a Researcher at NICTA (later CSIRO's Data61), also in Sydney, where I worked on network security and was part of the Security Business Team.

I hold a PhD from Technical University of Munich. I did both my post-grad and under-grad studies at Eberhard Karls University, Tuebingen, one of Germany’s classic universities.

Organisations

My research interests revolve around understanding and improving the Internet for everyone, with a particular focus on security aspects. Most recently, I have been working on

• Global-scale measurement of Internet service deployments and their security
• Data-driven security mechanisms
• Analysis of emerging technology and its implications

I view my work through the lens of real-world implications. The tech is not always what matters—it’s the embedding in our world that makes it meaningful. Hence, I work with other disciplines and industry alike to make the Internet a safer, more secure, and altogether more interesting and useful place.

Publications

Research profiles

I currently teach:

• Empirical Security Analysis & Engineering (202100073)

I am a Fellow of the UK's Higher Education Academy.

Affiliated study programs

Courses academic year 2026/2027

Courses in the current academic year are added at the moment they are finalised in the Osiris system. Therefore it is possible that the list is not yet complete for the whole academic year.

Courses academic year 2025/2026

Courses academic year 2024/2025

Address

University of Twente

Zilverling (building no. 11)
Hallenweg 19
7522 NH Enschede
Netherlands

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Organisations