Natasa Ailamaki (Alumnus.CEID 1990, https://people.epfl.ch/anastasia.ailamaki) was honored with the Nemitsas Award (http://www.nemitsasfoundation.org/). An article from the local press can be found here: http://www.thebest.gr/news/index/viewStory/502410
Thanos Nikolakopoulos (PhD CEID 2016) received the “Best Paper Award in Mining and Learning with Graphs Workshop @ ACM KDD 2018”, in collaboration with Professor D. Berberidis and Professor and Honorary Doctor of the Departments of Electrical and Computer Engineering and Computer Engineering and Informatics, University of Patras Georgios B. Giannakis.
You can find the paper here: