Ondrej studied Computer Science at the Faculty of Mathematics and Physics at Charles University and University of Pittsburgh - Joseph M. Katz Graduate School of Business (MBA). During his studies at Charles University he started to work in company IPEX a.s. Later he became Technical director and member of board there. Ondrej has been CEO of the CZ.NIC association since December 2004. Herewith his duty in CZ.NIC Ondrej acts in boards of the association NIX.CZ (Neutral Internet Exchange), associations Euro-IX (European Internet Exchange Association) and DNS-OARC (The Domain Name System Operations Analysis and Research Center). He served as a member of ccNSO council (Country Code Names Supporting Organisation) at ICANN. He is currently member of Security, Stability and Resiliency Review Team of ICANN.