Eirini Arvaniti is a student, currently in the last year of her undergraduate studies at the National Technical University of Athens. She is carrying out her diploma thesis in the area of Programming Languages, under the supervision of Kostis Sagonas. This is how she learned about Erlang and got involved in the development of PropEr. She has implemented the PropEr library modules that offer support for model-based testing of stateful reactive systems. Starting September 2011 she will be a graduate student at ETH Zurich, in the area of Computational Biology and Bioinformatics.