Jo Haazen, born Jozef Willem Haazen on December 24, 1944, is a renowned Flemish musician and carillonneur. He pursued his education at the Royal Conservatoire Antwerp and the Royal Carillon School "Jef Denyn" in Mechelen, Belgium, and also studied Esperanto. Haazen's career as a carillonneur began in 1968 when he became the city carillonneur of Antwerp. In 1981, he transitioned to the role of city carillonneur of Mechelen and took on the directorship of the Royal Carillon School "Jef Denyn," a position he held until 2010. During his tenure, he was instrumental in establishing the Queen Fabiola Competition. In 2001, he became the carillonneur for the new carillon at Saints Peter and Paul Cathedral in Saint Petersburg, Russia. Haazen has been recognized with several awards, including the Berkeley Medal for Distinguished Service to the Carillon in 1987, honorary membership in The Guild of Carillonneurs in North America in 1993, and the Gaston Feremansprize in 2015. Additionally, he collaborated with the Universal Esperanto Association on a project to amend the Universal Declaration of Human Rights to include "human obligations."