[4] As a high-school professor he taught in Banja Luka and served as a librarian of the Royal museum in Sarajevo.

As a highly prolific writer, Skok published dozens of books and hundreds of research papers in journals; his revised bibliography by Žarko Muljačić extends it to more than 650 works.

Some of his notable books are:[6] He left in manuscript an unfinished etymological dictionary that was published posthumously by his disciple and co-worker Valentin Putanec in four volumes under the title of Etimologijski rječnik hrvatskoga ili srpskoga jezika, 1971–1974.

In the words of academic August Kovačec, Skok's etymological dictionary is a synthesis of "his scientific efforts as a whole in the fields of etymology and linguistics generally" and represents the most notable "contribution of a scientific individual to Croatian language and the study of Croatian language in the 20th century".

[citation needed] In the honour of Petar Skok etymological-onomastics conferences are held with contributions of Croatian and foreign experts.