Peter Dabac graduated from the Faculty of Mechanical Engineering and Naval Architecture, Department of Mechanical Engineering. However, he has worked as a professional photographer since 1960, when he began collaborating with the Tošo Dabac Atelier. He has been a freelance artist since 1966, and in 1970 he became a member of ULUPUH. In 1970, after the death of Dabac, Petar inherited his atelier. He was the owner and head of the atelier and its event organizer until 2006, when he sold it to the City of Zagreb.

In the 1980s, he organized forty exhibitions of contemporary photography by domestic and foreign photographers at the Tošo Dabac Atelier. From 1991 to 2008, he taught photography at the Academy of Fine Arts in Ljubljana. He exhibited in numerous solo exhibitions at home and abroad.