Grootjans was born at Wilrijk. He became a licentiate in the trade and consular sciences and was chief editor and director of the newspaper De Nieuwe Gazet. He was a Municipal Council member (1971–1986) in Antwerp and a member of parliament (1954–1987) for the district Antwerp for the PVV.
Born in Wilrijk, Grootjans obtained a licentiate in trade and consular sciences. He was chief editor and director of De Nieuwe Gazet, served on the Municipal Council in Antwerp from 1971 to 1986, and represented the district Antwerp as a member of parliament for the PVV.