I am a PhD candidate at Columbia University under the supervision of Roxana Geambasu. Over my years in Columbia, I have also collaborated with other great people, including Jason Nieh, Suman Jana, and Daniel Hsu. During the summers of 2017 and 2018, I had two wonderful internships at Microsoft Research, where I worked with Marina Polishchuk and Patrice Godefroid on cloud security testing.

Before joining Columbia, I was a member of the European Organization for Nuclear Research (CERN), where I contributed to Agile Infrastructure. Some distinguished former colleagues made these interesting presentations: Configuration Management and CERN's OpenStack Cloud.

My alma mater is the National and Kapodistrian University of Athens (UOA), Department of Informatics and Telecommunications. I worked there with Alex Delis from Management of Data, Information & Knowledge group and with Mema Roussopoulos from the Distributed Systems Lab.


Broadly speaking, my research insterest is in the area of computer systems. My goal is to design and implement abstractions for reliable and secure systems. I firmly believe that identifying the right level of abstraction is the most important research step for solving difficult systems problems. I am currently focusing on contributing new ideas (and learning from past ideas) in the areas of program analysis for software testing, operating systems, and applications of machine learning to systems problems. Here is a literature review in these areas.


  • Vaggelis Atlidakis, Patrice Godefroid, Marina Polishchuk. ''RESTler: Stateful REST API Fuzzing.'' In Proceedings of the 41st International Conference on Software Engineering (ICSE'19).

    [paper] [slides] [talk]

  • Mathias Lecuyer, Vaggelis Atlidakis, Roxana Geambasu, Daniel Hsu, Suman Jana. ''Certified Robustness to Adversarial Examples with Differential Privacy.'' In Proceedings of the 40th IEEE Symposium on Security and Privacy (S&P'19).

    [paper] [slides] [talk] [code]

  • Vaggelis Atlidakis, Jeremy Andrus, Roxana Geambasu, Dimitris Mitropoulos, and Jason Nieh. ''POSIX Abstractions in Modern Operating Systems: The Old, the New, and the Missing.'' In Proceedings of the 11th European Conference on Computer Systems (EuroSys '16), London, UK, April 2016.

    [paper] [slides] [talk] [code]

  • Florian Tramer, Vaggelis Atlidakis, Roxana Geambasu, Daniel Hsu, Jean-Pierre Hubaux, Mathias Humbert, Ari Juels, and Huang Lin. ''Discovering Unwarranted Associations in Data-Driven Applications with the FairTest Testing Toolkit.'' In Proceedings of the 2nd European Symposium on Security and Privacy (Euro S&P '17), Paris, France, April 2017

    [paper] [slides] [talk] [code]

  • Vaggelis Atlidakis, Mema Roussopoulos and Alex Delis. ''Changing the Unchoking Policy for an Enhanced Bittorrent.'' In Proceedings of International European Conference on Parallel and Distributed Computing (EuroPar '12), Rhodes, Greece, August 2012.

    [paper] [slides]

  • Journals & Magazines

  • Vaggelis Atlidakis, Jeremy Andrus, Roxana Geambasu, Dimitris Mitropoulos, and Jason Nieh. ''POSIX has become outdated.'' USENIX ;login: Magazine, 41(3), Fall 2016.


  • Vaggelis Atlidakis, Mema Roussopoulos and Alex Delis. ''EnhancedBit: Unleashing the Potential of the Unchoking Policy in the BitTorrent Protocol.'' Journal of Parallel and Distributed Computing (JPDC),
    Vol. 74, Issue 1, pp. 1959-1970, January 2014.


  • Personal

    I was born in Athens, Greece and used to live in Galatsi. My mother, Chrysoula, is now on pension and my father, Pavlos, works for the public sector. I have a brother, Konstantinos, who is an undergraduate student at Athens University of Economics and Business, Department of Statistics.

    Life taught me not to forget people who stood by me and helped me realize my dreams; and there are plenty of them! First of all, I am deeply thankful to my parents who dedicated themselves to raising me and my brother. I am also grateful to my high-school teacher Aris Arabatzis who helped me find out my love for mathematics. Last but not least, I feel deep respect for my undergrad advisors, Alex Delis and Mema Roussopoulos, who helped me tremendously during my first research steps.

    Apart from computer science, I am also interested in international history, politics, and macro-economics. I am a passionate opponent of neo-liberalism and austerity which, in our days, is an insurmountable obstacle to the prosperity of the EU according to the opinion of multiple prestigious elite academic members, including Joseph Stiglitz (Columbia University), Paul Krugman (Princeton University), Thomas Piketty (Paris School of Economics), and many more.

    My political views and generally my approach of life is absolutely reflected in the following quote:

    “Above all, always be capable of feeling deeply any injustice committed against anyone, anywhere in the world.”


    The preferable way of reaching me is via e-mail.