1. Research Assistant, Institute for Medical Research, Zagreb.
2. Head Department of Mineral Metabolism, Institute for Medical Research, Honorary Professor in Physiology University of Zagreb.
3. Full Professor of Medicine, Head Department of Nuclear Medicine, Medical School, University of Zagreb.
4. Head Nutrition Department, Institute of Public Health of Croatia, Zagreb, Honorary Professor School of Public Health, University of Zagreb.
5. Nutrition Department, Institute of Public Health of Croatia, Zagreb.
6. Professor of Mineral Metabolism, University of Leeds, Honorary Consultant Physician to the General Infirmary Leeds, Director MRC Mineral Metabolism Unit Leeds, England.