Marie Prins is a retired electrical engineer. She is a member of the board of the Stichting Skepsis (NL) and an active member of SKEPP (B) and of the Vereniging tegen de Kwakzalverij (Union against Quackery) (NL) She writes for Skepter (NL), Wonder en is gheen Wonder (B) en the Tijdschrift tegen de Kwakzalverij (NL). Her articles mainly cover the misleading if not bare lies about "food supplements" that are being offered in such a way that the buyer expect them to be medicines. She also regularly files complaints about these misleading advertisements.