Daniel Nagaj studied mathematical and theoretical physics at Comenius University in Bratislava, Slovakia, doing undergraduate research with Prof. Buzek at the Slovak Academy of Sciences. He finished his PhD in theoretical physics (quantum information) at MIT in 2008 under the guidance of Prof. Farhi, focusing on quantum complexity of local Hamiltonian problems as well as adiabatic quantum computing. After returning to work as a postdoc at the Research Center for Quantum Information of the Slovak Academy of Sciences for four years, he moved to Prof. Verstraete's group at the University of Vienna, where he investigates quantum complexity, quantum walks and tensor product state methods.