Maas was a son of Arnoldus Johannes Josephus Maas and Maria Margaretha Pompe. He grew up opposite the Most Holy Heart of Jesus Church in Rotterdam, where he served as an altar boy. He attended Dominicus College in Nijmegen and in 1928 joined the Dominican Order. He studied Spanish in Spain and after his ordination to the priesthood (1934) left as a missionary to Puerto Rico . He painted and watercolors in his spare time. In 1946 he received permission to train as an artist. He was apprenticed to the Dutch glazier Joep Nicolas , who at that time in the studio RambuschNew York worked. He also took painting lessons with Rufino Tamayo in New York and with Cristóbal Riuz at the University of Puerto Rico, who painted his portrait in 1948. Nicolas had been commissioned for 20 windows for the Brooklyn cathedral. When he moved back to the Netherlands in 1958, Maas was asked to make the last ten windows. Maas has exhibited at the Cincinnati Art Museum, the Corning Museum of Glass in New York and the Instituto de Cultura Puertorriqueña, among others. He received commissions for stained-glass and stained-glass concrete windows, crucifixes and murals in America and the Netherlands. Maas died in 1981, at the age of 72. Five years later, his widow published his biography. To commemorate 500 years of Dominicans in Puerto Rico, a duo exhibition was held in 2011-2012 at the Museo de Las Américas in San Juan, featuring work by Maas and the painter Eric Tabales.