A very prolific science fiction/fantasy/sf author. His common themes are transformations of all types (but most commonly gender changes and changes to alien/fantasy races) alternate universes (especially fantasy and either high-tech or maybe just normal, present-day Earth-like worlds that somehow cross or exchange characters), reinterpretation of religious beliefs, and the great machine that runs everything.

Some series by Jack Chalker:

And some single volumes:

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