Dillen was born in 1962. His father was a representative and councilor for the Volksunie party in Balen. He graduated as a general practitioner at the Catholic University of Leuven in 1988 before training as a physician for disabled patients at the University of Antwerp. He then worked as a public general practitioner in Mol and as a physician at a mental hospital. Dillen is a member of the Antwerp chapter of the Domus Medica organization.[1]
After being a member of the Volksunie as a teenager, Dillen joined the New Flemish Alliance in 2008. He was elected as a provincial councilor in 2012 for the N-VA in Antwerp and was a municipal councilor in Mol from 2012 to 2024. In the provincial council he was chairman of the Welfare Committee from 2018 to 2024.[2] During the 2024 Belgian regional elections, Dillen was elected to the Flemish Parliament for the Antwerp list and was designated as a community senator in the Belgian Senate.[3]
