About

Johann Petrak is senior researcher at the Austrian Research Institute for Artificial Intelligence (OFAI) and also a research fellow at the University of Sheffield, Natural Language Processing Group at the Computer Science Department. He is a machine learning and NLP expert and an enthusiastic developer of open source software. Amongst others, he is part of the core development team of the GATE NLP framework and main designer and developer of the Python GateNLP package. His research topics include machine learning approaches for text tagging, learning to rank and metric learning, approaches to natural language processing based on imitation learning and cost-sensitive learning and the synergies between knowledge representation and ontologies on the one hand and natural language processing on the other hand.