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Piotr Sapiezynski

Associate Research Scientist


Office Location

805 Columbus Avenue
660 Interdisciplinary Science & Engineering Complex (ISEC)
Boston, MA 02120

Mailing Address

Northeastern University
ATTN: Piotr Sapiezynski, 435 ISEC
360 Huntington Avenue
Boston, MA 02115


  • PhD, Technical University of Denmark
  • MSc, Technical University of Denmark
  • BSc in engineering, Warsaw University of Technology, Poland


About Piotr

Where did you grow up?

Warsaw, Poland.

What are the specific areas of your graduate education?

I obtained my master’s with honors from the Technical University of Denmark. Then, I continued my work on data science at the same university and obtained a PhD After a short postdoc there, I am now at Northeastern University, working with Professor Alan Mislove and Professor Christo Wilson on privacy and fairness in machine learning.

What are your research interests?

My research is centered around the behavior of individuals, and the interactions people have with one another and with computer systems. I apply machine learning and other statistical approaches to model spreading of diseases and information, human mobility and interactions, and to infer relationships and life outcomes of study participants. I measure the impact of one’s actions and social network on their privacy. Finally, I investigate algorithmic black boxes and study ways of detecting, measuring, and eliminating biases from automated decision making systems.

What aspect of what you do is most interesting?

The bias in algorithms comes from many places: how the training data is collected and processed, the standards against which the algorithms are tested, optimizing for what we can measure, rather than for what the real goal of the systems is, etc. The field is maturing quickly, but there is so much more to discover.

What’s one problem you’d like to solve with your research or work?

I would like to make decision-making systems more transparent and understandable both for the people who operate them, and those affected by them.