After his graduation in Rotterdam, Willem Koomans became as a doctor in Fijnaart, Brabant, The Netherlands. Next he moved to Leiderdorp, then to Abcoude. He stopped exercising his profession at the age of 71.
Willem Koomans married twice. His first wife was Aagje Fontijn (†1849) from Mijdrecht. His second wife was Alida Jannetta Vermeer from Amsterdam whom he married in 1851. They had several children. She died in Abcoude in the Spring of 1890.
In May 1916 Willem Koomans (98) had been a physician for 75 years. By then he was known as "De Oude Koomans" ("The Old Koomans"). Willem Koomans died on August 10, 1917, in Abcoude-Baambrugge, aged 99 years and 3 months.
|De Grondwet, 5-12-1916||Algemeen Handelsblad, 11-8-1917|
Sources: Delpher Newspapers, WestBrabantsArchief.nl, WieWasWie.nl.