Zadek founded Cobham Pottery (Surrey Pottery Ltd), which ran from 1947 to 1956. He worked with many distinguished potters and remained good friends with Bernard Leach until Leach's death in 1979.
He is best known for his coloured slip decorated earthenware.
Various potters worked with him during the nine years, including Benny Sirota, one of the co-founders of Troika.
The earthenware pots were slip decorated in simple attractive designs.
Zadek continued to pot after the closure of Cobham Pottery, using his DZ mark.