The PhD program in Network Science is a research-oriented program, which provides essential tools to study complex systems including society online and offline, the economy, or urban traffic. It includes training in theoretical and computational methods and coursework on the basic notions and theories of complex networks including hands-on experience with large datasets. Students will have the opportunity to focus on specific related fields, like mathematics, sociology, political science or environmental science. During their research work, students will participate in international research projects and by the end of their PhD studies they will develop into independent researchers, with the ability to contribute to network science by analyzes and modeling empirical data. Network science is a rapidly developing new discipline with ample opportunities to do fundamental research. Doctoral enrollment may continue up to a maximum of six years. Students admitted into CEU doctoral programs are eligible to receive the CEU Doctoral Fellowship for up to three years. Numerous additional funding opportunities exist.