After graduating as a medical doctor, de Wever settled in Heerlen in 1897[REF] (some sources say 1896[REF]) on the urge of mayor and pharmacist Charles de Hesselle (a colleague of de Wever's father, who was a pharmacist in Nuth) [REF].
In the early years he made use of horse and carriage to serve his patients, but in November 1902 a car was used (made by Cudell from the nearby city of Aachen) [REF].