Portrait of Henri Lotze

Dr. Henri Lotze

Hello, I am a computer scientist from Germany. I studied computer science in the years between 2012 ‒ 2018 at RWTH Aachen University and obtained my masters degree with honors in 2018. Subsequently, I was employed as a research assistant at the theory group at RWTH Aachen University, lead by Prof. Dr. Peter Rossmanith, where I obtained my doctoral degree.
I like playing around with the standard model for online algorithms in my research. In my free time, I enjoy doing sports, playing tabletop role playing games, endlessly configuring my devices and being humbled by how hard good typesetting and layouts are to achieve.

Feel free to contact me via mail!


For the most up-to-date and complete list of my publications (including arxiv.org-links), visit my dblp page.
  • Online Simple Knapsack with Bounded Predictions (to be published)
  • STACS 2024: Matthias Gehnen, Henri Lotze and Peter Rossmanith
  • Online Node- and Edge-Deletion Problems with Advice
  • Algorithmica: Li-Hsuan Chen, Ling-Ju Hung, Henri Lotze, Peter Rossmanith
  • Since publishing, we have found a number of small errata in this work. Please consult chapter 2 of my dissertation for a cleaned up version.

Recorded Talks

Public Software

Algorithmic Battle

Let teams compete by making them create hard instances and fast solvers for problems of your choice. Then pitch these instances and solvers against one another. All language-agnostic. More information here

Algorithmic Battle - Problems

Companion collection of sample problems for the algobattle framework. Try some of these out to familiarize yourself with the algobattle framework.

Algorithmic Battle - Web

Companion webserver for the algobattle framework. Manage Problems, teams with their code and results and schedule automatically executing battles. All packed up in containers.

Exercise System

Basic framework to modularly create exercise sheets using Latex, a little bit of python and some Makefile magic. Tasks are named and collected in a big catalogue file. New exercise sheets are created by simply referencing their catalogue names.

I like the principle "Public Money? Public Code!". Thus, all software worth publishing developed during my employment in a public position is published under the MIT License.
This means you can do with it whatever you want (even sell it and/or use it in proprietary software, which may be controversial to some).


I am trying to take pleasant pictures that I can use as wallpapers on my mobile devices. If you are interested in such pictures as well, I have linked a few of them here (~300kB total preview size).
The pictures on this linked page are licensed under Creative Commons BY-NC-SA 4.0 (where applicable).