Sergej M. Kostić, graduated engineer of geology at the department for applied geophysics. He studied at Faculty of Mining and Geology University of Belgrade in the period 1968-1974.Between 1974 and 1998, he worked in NIS-NAFTAGAS, Geophysical institute in Belgrade. At the beginning of 1998 he founded a private company "GEOFIZIKA-ING Ltd." Belgrade, where he works today. He passed expert (the state) in 1980,front of the commision of the Ministry of Mining and Energy Republic of Serbia. In 30 years of practice of research,he participated in the drafting and implementation of more then 60 projetcs and studies in field of research deposits: copper (ore zone Bor, Majdanpek, Čadinje, Lece, Bučim); lead and zinc (ore field Trepča, Ajvalija - Kišnica, Besna Kobila); gold (ore fields Blagojev kamen, Bor, Majdanpek, Veliki Bukovik u Raškoj); iron (Radovan Planina, BiH). Od 1985. Since 1985, he expands activity to the field of hydrogeology, primarly to research of groundwater in Karst (environs of Bor, Majdanpek, Pirot, Valjevo, Mionica, Bela Palanka). He participated in the research collector thermal and thermo-mineral waters Brestovačka i Gamzigradska Banja, Soko Banja, Banja Vrujci, Dag Banjice near Pirot i etc. Since 1998 with team "GEOFIZIKA-ING Ltd." he participate in the implementation of project related to research groundwater for bottling. From major project there are: “VODA - VODA”, “HEBA”, "KNJAZ MILOŠ", Voda “VUJIĆ”, “AQUA BIANCA”, “RAJKOVIĆKI IZVORI”, “GOLIJSKA EKO” and etc. He worked in implementing project abroad ( Republic of Turkey and the Republic of Ireland). He is author of many papers that he presented at professional conferences in the country and abroad. The most significant works of them were shown at 53. (Firenca, 1991) and 54. (Pariz, 1992) Congress of the European Association of Geophysicists (EAEG).

Mara S. Vukčević, graduated engineer of geology at the department of hydrogeology. She studied at the Faculty of Mining and Geology University of Belgrade,in the period 1972 do 1978. Between 1982 and 2001 she worked in Geoinstitute in Belgrade,when she moved to “"GEOFIZIKA-ING Ltd." Belgrade, where she works today. She passed expert (the state) in 1986,front of the commision of the Ministry of Mining and Energy Republic of Serbia In 25 years of practice of research,she participated in the drafting and implementation of more the 40 project and studies in the field of hydrogeological research, the development of hydrogeological maps,mineral and thermal waters and drinking water. She was chief research team in making basic hydrogeological maps at scale 1:100 000, sheets: Titovo Užice, Prijepolje, Čačak i Novi Pazar. Among the major projects there are research of thermal and thermo-mineral waters of Banja Koviljača, Zvonačka Banja, Gornja Trepča, Palanački Kiseljak, Banja Vrujci, Visoke near Arilje, Dag Banjica near Pirot and etc. During the development of master's thesis she was performing research in the field of radioactive mineral water. She also was working on hydrogeological research in brick industry. As a chief of team "GEOFIZIKA-ING” Ltd." Belgrade,she participated in implementation of projects related to research of groundwater for bottling and thad: “VODA - VODA”, “AQUA BIANCA”, “RAJKOVIĆKI IZVORI”, “GOLIJSKA EKO”, ”SIĆEVAČKA BANJICA” and etc. She is responsible project engineer more of Elaborate of groundwater reserves and major project of exploitation these waters as a basis for obtaining the decision on exploitation. She is author of many papers that were presented at professional conferences in country and abroad ( Karpatobalkan association, Athens 1996 ).

Tanja R. Pajčić, graduated engineer of geology at the department of hydrogeology.She studied at the Faculty of Mining and Geology University of Belgrade. Since 2005 she has been employed in the company "GEOFIZIKA-ING Ltd." Belgrade,where she works today. She worked on the development and implematation of a number of reports, projects and elaborates in field of hydrogeological research. As an associate,she participated in the development and realization of projects hydrogeological research in the field of Spring Bezdan, Kavak i Ćeltaš near Pirot and Gornja Toplica near Mionica. She participated in the development more of Elaborate of groundwaters deposits in the area of mountains Golija and Belih voda near Kruševac. She speaks English.