Ernst Gideon Jansz (born 24 May 1948 in Amsterdam) is one of the founding members and frontmen of Doe Maar.

His father, born in Semarang on Java, is an Indo (Dutch-Indonesian), who went to the Netherlands in 1932 after finishing his study at the Batavia HBS to continue his higher education there.

Once Nazi Germany invaded the Netherlands his father was involved in the Dutch resistance movement, until he was captured and interned in a German concentration camp.

His Indo background has influenced much of his work (for Doe Maar), particularly "Rumah Saya" (My House or My Home),[2] which he wrote and recorded in 1980 for Skunk, one of the best-sold albums in Dutch pop history.

Gideons droom is about a second-generation Indo (Indo-European) Dutchman like himself; De Overkant is a three-part book dealing with letters between Jansz and his family (especially his father), the life of his mother, and an account of his trip to Indonesia.

[5] One off project by the Dutch Pop music foundation: Ernst Jansz, Joost Belinfante, Doe Maar members (without Henny Vrienten) and Bram Vermeulen & his band.