Fran Poštenjak is a native of Zagreb, Croatia and has lived in Sarajevo since 2013. He is a student and a freelance arborist. After high school graduation he attended (2005-2012) Urban forestry undergraduate course on Faculty of Forestry, University of Zagreb (143/180 ECTS). Fran became a certified European Tree Worker (ETW) in 2007. While studying he was working on various arboricultural and forestry assignments, volunteering since 2006 in Croatian Arboricultural Society (CAS) with assigned role as secretary assistant and he volunteered on a local urban greenery planning project for Our children society- Jastrebarsko (2013).
After moving to Sarajevo he enrolled in Horticulture undergrad..