Abelló inherited Abello Laboratories, which was founded by his pharmacist Father, Juan Abello Pascual, in 1925. In 1993, it merged with its largest competitor, ALK, to form ALK-Abelló.
Juan Abelló was born in 1941, in Madrid, the son of a pharmacist Father, Juan Abello Pascual. He has a bachelor's degree in pharmacy from the Complutense University of Madrid (1963), and a doctorate in phramacy (1978) from Madrid's Colegio del Pilar. He is a member of Spain's Royal Academy of Pharmacy.
Abello owns one of the last large triptychs painted by Francis Bacon, Triptych 1983 (1983), and a small triptych by Bacon, Three Studies for a Portrait of Peter Beard (1975). Abello is the only Spanish art collector to own multiple pieces by Bacon.