 Prasko served as pastor of Ss Peter and Paul Church in Melbourne from 1950 to 1958 before being consecrated Exarch of Australia and New Zealand on 17 October 1958.He became eparch of Australia, New Zealand and Oceania, 24 June 1982, when the exarchate was raised to an eparchy.Under his leadership, the Ukrainian Catholic Church served as "the genesis of the Ukrainian community and identity in Australia".