He attended the teacher training institute in Kláštor pod Znievom from 1889 until 1893, and finally studied business in Prague from 1898 until 1900.

[1] Between 1893 and 1904, Gregor worked as a teacher in Banská Bystrica, Horná Lehota, Brezno District, Kolárovice, Dohňany, Lopej, Pohorelá, and Podlavice.

During his later studies in Prague, he became a member of the Detvan academic association, which served as an introduction for him to Czech realists of the time.

[6] Most of Gregor's stories, initially disseminated through magazines and periodicals, and later collected in various volumes (e.g., Z dedini, Besednice, Smutné nôty), were centred on rural subjects.

His work in the theatrical field (e.g., "Ženský zákon", "Nový život", "Statky-zmätky", "V službe", "Hriech", "Tma", "Smrť Ďurka Langsfelda", "Jej prvý román") often also hinged on descriptions of rural environments.