Mario was born in Zagreb in 1973 to a catholic family. During the war, in 1991, he began his theological studies at Thelogocial Seminary Matija Ilirik in Zagreb, Croatia. During his second year a christian befriended him and began witnessing to him.
Jerry and Zuzanna are the founders of International Strategies for Transformation (IST), and they reside in Zagreb, Croatia. They met in the former Yugoslavia, where Jerry was then serving as a missionary, and they were married in Serbia, soon after.