He completed his secondary education in Budapest and Kalocsa. He then entered the Society of Jesus, and the order sent him to Innsbruck to continue his studies. He has been a member of the Diocese of Vác since 1915. He was ordained a priest on May 21, 1916. In 1927, he left for the United States, but fell ill on several occasions, so he returned to Hungary multiple times and eventually settled there permanently. He was placed on retirement in 1943; his relatives took him in, but he lived in near poverty. His house in Pásztó was destroyed during the war, so in 1946 he requested reinstatement, but it was denied; he was given a parsonage in Vác, where he lived until his death. The Chicago memorial book remembers him as follows: “Fr. Kasztovszky could not get used to the American way of life. It always remained strange to him that on the north side of the city, the faithful lived scattered far apart from one another in all directions. He was a priest of exemplary life and an excellent orator, but the English language remained a barrier for him in reaching the larger group of parishioners.” Since he did not receive an official position, he undertook pastoral assistance. According to records, even in his seventies, he would cycle to Vác-Deákvár every week to celebrate Mass. In Chicago, IL, his memory is preserved by a traveling trophy, which is awarded to the young person who recites most beautifully.