Jerome S. "J.S."Spevack was an American scientist, inventor, and engineer who developed the "dual temperature exchange sulphide process" (known as theGirdler sulfide process) in 1943 while working on theManhattan Project.^[2] This is regarded as the most cost-effective process for producingheavy water. A parallel development of this process was also achieved in 1943 byGermanphysical chemistKarl-Hermann Geib.^[3]

AfterWorld War II, Spevack became president of Deuterium of Canada Limited (DCL)^[4] and, in 1974, won a lawsuit^[5] against theUnited States government and itsAtomic Energy Commission receiving protection, and compensation ofUS$1.5 million, over their use of the Girdler sulfide process without his consent.

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