Born 28 May 1909.
Died on 11 August 1986 in Vilnius.
Returned to Lithuania with his parents in 1913. He studied at the Kėdainiai Gymnasium. In 1937 he graduated from the Faculty of Theology and Philosophy of Vytautas Magnus University and until 1946 he taught at Šakiai, Kybartai, Kaunas, Panevėžys, Kėdainiai Gymnasiums and Panevėžys Teachers' Seminary. During his studies, he worked as a language editor in the editorial office of Židinis. In 1946, he started working at the State Publishing House of Fiction, which also had its own department in Kaunas, and worked there for several decades, before moving to Vilnius for the last years of his life. While working at the Vaga publishing house, A. Žirgulys was a pioneer in the preparation of volumes of the classics of Lithuanian literature in Lithuanian culture, and edited them himself. He edited volumes or multi-volume writings of Žemaitė, Vaižgantas, Lazdynų Pelėdos, Gabrielė Petkevičaitė-Bitė, Mikalojaus Katkus, Vincas Mykolaitis-Putinas. He wrote in "Ateitis", "Židinis", "Rytas", "XX amžiuje", "Naujoji Romuva", "Lietuvos mokykla", "Tautos mokykla", "Gimtojoje kalboje". He has written on language issues in "Pergalė", "Literatur ir mene", "Kalbos kultura". Translated about 50 works. He collected over 3000 words for the "Dictionary of the Lithuanian Language" in Surviliškis parish. Contributed to the dictionary, vol. 1: proofread it, added words from his parish and from Zanavyk. Collected folklore. In 1947, he published D. Poška's "Mužika Žemaičių ir Lietuvos". Together with K. Gasparavičius, he prepared the 1948 "Dictionary of Lithuanian Spelling" and contributed to the "Language Practice Advice". He wrote on issues of language culture.