Congratulations to our MSc graduates Georgios Dialektakis and Styliani Kyrama for their excellent MSc theses, which were selected by our teaching staff as the two best theses of the 2020-2021 class. Both theses have achieved great results in cutting-edge data science topics. The thesis of Georgios was about “Conditional Adversarial Learning to Enhance Bot Detection” and that by Styliani was about “Complex Event Processing”. It was a very difficult decision, among several high quality MSc theses. We are very happy about the hard work that all our students put into their MSc theses and their great achievements!