In the later stages of his career, Voulkos primarily fired in the anagama kiln of Peter Callas in New Jersey, which introduced and Japanese wood fired aesthetics to America. Volumes and Callas would go on to collaborate together for the next 23 years. This partnership and the work produced during this time, is considered by many curators and collectors to be the most successful period of his career. Voulkos' works are freely-formed in structure and have vibrant decorations. During the shaping process, Voulkos would tear, pound, and gouge the clay.

Voulkos' works have been on display around the world, including the Japanese Folk Crafts Museum, the Museum of Modern Art and the Stedelijk Museum Amsterdam.

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