A Greek Catholic priest, dean, and member of the Holy See’s Council, he was among the first Hungarian and Rusyn Greek Catholic pastors in the United States and an active participant in the movement to establish the Hungarian Greek Catholic Diocese.
His father was Pál Sereghy, a Greek Catholic priest, and his mother was Vilhelmina Jaczkovics. He grew up as a member of the Sereghy–Jaczkovics family, which had produced priests for several generations. He completed his theological studies in Uzhhorod and Budapest, and was ordained a priest on September 26, 1886, by Bishop János Pásztélyi Kovács of Munkács.
His first assignment was in Márk (Zemplén County), where he served as a pastor from 1886 to 1891. During the first major wave of emigration to the United States, he undertook pastoral work among Greek Catholic faithful who had emigrated to the United States. He arrived in the United States in 1891, where, according to contemporary American sources, he also served in New York State, and by December 1891, he was listed among the participants at a Greek Catholic priests’ conference held in Hazleton, Pennsylvania, as listed as “Alexander Sereghy, Brooklyn, N.Y.” The conference was a defining event in the history of the Greek Catholic Church in the United States, at which the participating priests deliberated on the establishment of an independent ecclesiastical organization for Greek Catholic faithful and the protection of their rights.
According to Hungarian sources, the main center of his ministry in the United States was Scranton, Pennsylvania, where he served between 1891 and 1894. At the same time, based on American sources, it can be established with certainty that he was associated with Brooklyn by the end of 1891; therefore, the exact chronology of his ministry in the United States requires further archival research. What is certain, however, is that he was among the first Greek Catholic priests in the United States, and in 1893 he appeared in a contemporary group photograph depicting the American Greek Catholic clergy.
In 1894, he returned to the Diocese of Munkács and became the parish priest of Uglya (Máramaros County), where he served until 1903. He was subsequently appointed Greek Catholic pastor of Nyírvasvár. In 1905, he became dean of the Nyíri Deanery, and in 1911, he was appointed a member of the Holy See Council. As dean, he was considered one of the leading figures of the Greek Catholic Church in Szabolcs County.
He is also credited with supporting the Hungarian Greek Catholic Church’s efforts to achieve autonomy. At the national Greek Catholic assembly held in Hajdúdorog on September 12, 1911, he was elected to the committee tasked with preparing for the establishment of a Hungarian-speaking Greek Catholic diocese. The committee’s task was to prepare for the organization of what would later become the Diocese of Hajdúdorog; thus, Sándor Sereghy became directly involved in the movement that led to the establishment of an independent Hungarian Greek Catholic diocese in 1912.
He passed away on March 20, 1912, in Nyírbaktán. The Greek Catholic press of the time also commemorated his death, highlighting his pastoral zeal and his service as a dean. His family life was closely tied to the Greek Catholic clergy: his wife was Mária Puza, daughter of Puza