He moved to Japan and in 1968 in partnership with Stuart Dowsey founded The Ishi Press, a book and magazine publishing company that primarily published books about the game of go.
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Perhaps best known as a puzzle inventor, he commercially licensed his designs, such as the Rush Hour puzzle game, to companies including Binary Arts (now known as ThinkFun), Ishi Press, and Hanayama Toys.
Ishi Press' first few publications were translations of Japanese books such as Eio Sakata's The Middle Game of Go and Modern Joseki and Fuseki Vol. I and II but Bozulich soon began working with Japanese professional players, as well as principal collaborators James Davies and John Power, to produce original works in English.