Jacobus Johannes du Plessis was a prominent South African singer-songwriter and poet, colloquially known as Koos Doep. Although he received critical acclaim for much of his work, he became best known for the runaway success of a rendition of his song Kinders van die Wind by Laurika Rauch. Koos du Plessis was born in Rustenburg. He was the youngest of four children, and grew up in the mining town of Springs. After school, he attended the University of Pretoria, and the University of the Witwatersrand, majoring in Afrikaans-Nederlands. At university he met his future wife, Mornay. The couple had three daughters, Irma, Karien and Karla. Koos would eventually write a song for each of these four women in his life. Koos worked as journalist and editor for several Afrikaans publications. He died in a car accident close to Krugersdorp during the early morning hours of 15 January 1984. In 2010 two albums were released in The Netherlands. First Ofschaaid Zunder Woorden, an album with songs of Du Plessis sung in Grunnegs by Wia Buze and Klaas Spekken. Karla du Plessis joins for a special duet on this album. Secondly Die Land Van Blou Saffiere is released in the Tussen Kontinente-series. This release is a hardcover book with a biography, lyrics with footnotes and explanations, backgrounds and a cd with 20 of his songs.