Castle's first experience of
pottery was as a 10-year-old, seeing Olive Jones demonstrating at the Auckland Easter Show. Castle began making his first pottery in 1947 and took night classes with
Robert Nettleton Field at
Avondale College, Auckland. In the early 1960s, Castle had an architecturally designed house built in the bush of the
Waitākere Ranges at 20 Tawini Road,
Titirangi, with a kiln and rail system out the back, and a low basement which allowed pottery to be exhibited. The Boyes family, which bought the house, demolished the kiln; however, the bricks from it form the paving round the lower part of the house, and shards from discarded pottery works can still be found amongst the clay soil of the bush behind. Castle studied pottery in
Japan,
Korea and
China in 1966–67. He named
Shoji Hamada as one of his influences. Castle built a new house in South Titirangi with a larger kiln and even more extensive railway to serve it in 1972–73, which is still operating. In 1989, along with a number of other New Zealand ceramic and glass artists, he was commissioned to supply work for the exhibition
Treasures of the Underworld for the New Zealand pavilion at the
World Expo at
Seville in 1991. This work is now in the collection of the
Museum of New Zealand Te Papa Tongarewa. Castle died on 29 September 2011, and was cremated at the
Purewa Crematorium. ==Honours and awards==