Draženko Celjak is the head of data services at SRCE – University of Zagreb University Computing Centre. He coordinates and leads the development of several national infrastructures and services, including the national repository infrastructure Digital Academic Archives and Repositories (DABAR) and the Portal of Croatian Scientific and Professional Journals (HRČAK). Draženko is a national Research Data Alliance (RDA) Node coordinator for Croatia and European Open Science Cloud (EOSC) Promoter. He is currently involved in the EU-funded project National Initiatives for Open Science in Europe (NI4OS-Europe). His main focus is the development of infrastructure for open science.