He was employed by Algemeen Nederlandsch Fotobureau(ANeFo), and worked with them from 1957 to 1970. He mainly took photographs of military exercises,[1] and public figures (mainly musicians originating from English-speaking countries) of the 1960s, most notably The Beatles in 1964, when they appeared on Dutch television for a television special, with Jimmie Nicol taking the place of Ringo Starr on drums.[2] Koch mainly took photographs in his home country of the Netherlands, but also took photographs in other countries in Europe, such as Belgium and Germany.