He graduated in law from the Jagiellonian University in 1926, and defending his Ph.D. on the subject of the legal nature of a public commercial company in 1927.
In 1931, the Scientific Culture Fund granted him a scholarship to study abroad and three years later he published his habilitation thesis titled Personal protection of the attitude towards the work after the artist's death - general issues.
When World War II broke out, Grzybowski joined Border Protection Corps in Stryj defending the city from Soviet invaders.
Despite the defeat, he avoided capture by emigrating to Hungary where he became a scientific and literary manager for the Polish Library publications.
He escaped the camp again, a year later, and returned to Kraków where from 1946 to 1949 he served as a lecturer at the Cooperative Study of the Faculty of Agriculture and Forestry of the Jagiellonian University and at the College of Social Science; he was appointed Professor in 1949.