As well as being an editor of Acta Arithmetica from the beginning of the journal, Jarnik was active in organising university education and scientific research throughout Czechoslovakia.
Pati na rin ang pagiging isang editor ng Acta Arithmetica mula sa simula ng mga pahayagan, Jarnik ay aktibo sa organising unibersidad na edukasyon at pananaliksik sa agham sa buong Czechoslovakia.