My go-to style guide is The Chicago Manual of Style, and I switch regularly between Canadian, British, and American English. (As a copyeditor based in Vancouver, Canadian English—stuck halfway between British English and American English—is my home and native tongue, so that's what you’ll find in these pages.)
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I have edited essays in subjects ranging from contemporary and historical art, English, and sociology, to law, geology, and forestry, as well as experimental and fiction manuscripts.
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As luck would have it, the principles of writing aren’t subject dependent—although writing style and voice certainly can be. The only thing I might need from you if you are, say, a physics major, is a list of discipline-specific terms, along with an idea of the desired tone.