Kungliga Tekniska högskolan is looking for highly-qualified and motivated individuals to pursue a PhD in the area of data science. The prospect PhD students will join a research team in KTH led by professor Aristides Gionis ( https://www.kth.se/profile/argioni /). The research team focuses on developing novel methods to extract knowledge from data, modeling large-scale complex systems, and exploring new application areas in data science. Emphasis is given in the areas of graph mining, social-network analysis, modeling of information networks and social-network dynamics, as well as in emerging domains, such as interpretable AI. The work combines foundational research in algorithms with development of novel applications.