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Nikolaos Aletras


I am an Applied Scientist at Amazon, currently working on the Machine Learning Core team and previously on Alexa, the voice service that powers the Echo speakers. Prior to that, I worked as a Research Associate at the Department of Computer Science at UCL, Media Futures Group and I completed a PhD in NLP at the Department of Computer Science of the University of Sheffield under the supervision of Dr. Mark Stevenson.

My main research interests are in Natural Language Processing. More specifically, I'm interested in applying statistical methods for detecting the underlying topics in large volumes of text data as well as quantifying semantic similarity between words by developing distributional representations.

I also enjoy working on user-generated content in social media. I make use of supervised Machine Learning methods to infer user attributes and unveil patterns in language use by groups of people with different characteristics e.g. occupation or income.

My research interests include:

  • Topic Modelling
  • Social Media Analysis
  • Computational lexical semantics

For more details see my CV.

Recent News

  • Mar 17: I'm giving a guest lecture at University College London.
  • Mar 17: I'm giving a guest lecture at Warwick University.
  • Mar 17: I'm giving a talk at University of Leuven in Belgium.
  • Feb 17: I'm giving a talk at Imperial College London.
  • Dec 16: I'm giving a presentation at the Law and Economics Workshop, School of Law at King's College London
  • Nov 16: I'm giving a guest lecture at Kingston University Business School
  • Oct 16: Media coverage of our paper on predicting judicial decisions from the BBC, the Guardian, the WSJ, the Wired etc.
  • Oct 16: New paper in PeerJ Computer Science: Predicting judicial decisions of the European Court of Human Rights: a Natural Language Processing perspective
  • Apr 16: I've been selected in the "30 under 30" list of young Greek professionals by the Kathimerini newspaper.
  • Mar 16: I'm giving an invited talk and a guest lecture at the University of Warwick.