John P. Tackney was an Irish-born Maryknoll missionary. He was ordained on 22 June 1941 and assigned to Kweilin (Guilin), China. He and his group of newly ordained priests had arrived in Hong Kong just before the Japanese invasion and became trapped in the city and not able to proceed to their inland missions.
He was captured together with Fathers Madison and Knotek. They were manacled and held for three days in a garage on meagre rations, and then interned at Stanley Camp with other priests until September 1942 (see here). After release and having gained permission from the Japanese authorities to enter China, he and his group of fellow Fathers left Hong Kong in January 1943 and arrived safely in Kweilin on 2 February 1943. During the war, he also served as chaplain in the U.S. armed forces in the Indo-Burma Theatre.
Father Tackney returned to China at the end of the Pacific war and remained there until 1952. Later, he was assigned to Formosa (Taiwan).
Source
1. Catholic News Service - Newsfeeds dated 23 June 1941 See here
2. The Shanghai Evening Post and Mercury dated 5 February 1943. See here
3. Brooklyn Daily Eagle dated 5 February 1943. See here
4. The Catholic Courier Journal dated 17 March 1961. See here