Ljiljana Zornjak graduated from the Faculty of Mining, Geology and Petroleum Engineering at the University of Zagreb with a degree in petroleum mining. She has completed numerous specialized trainings in the field of reservoir engineering.
She gained professional experience in the industry at INA (Croatian Petroleum Company) as a reservoir engineer. Her duties included preparation of reports and reserve studies (oil, natural gas and geothermal water). Her duties included planning, supervising and analysis of hydrodynamic measurements in wells, preparation of production development plans, optimization of production of exploitation fields and preparation of reservoir engineering parts of feasibility studies for development projects for exploitation fields. She also participated in reservoir engineering projects for well workover.
She led a multidisciplinary team of development geologists, reservoir engineers, formation evaluation engineers, production engineers, and drilling engineers. The team addressed all aspects of optimizing operations in reference fields while complying with technical standards, occupational safety measures, and environmental protection.
Since March 2019, she has been working in the Croatian Hydrocarbons Agency, today as the Head of the Geothermal Potential Development Department. Her responsibilities include promotion of Croatia's geothermal potential, assessment of geothermal potential and participation in preparation and implementation of geothermal development projects in Croatia.