That's not actually S L Viehl. Well, she is, but she's actually Sheila Kelly, who writes under a number of different pseudonyms, one for each genre she writes in. S L Viehl is her science-fiction pseudonym, under which she writes the Stardoc series.
Since part of the point of having a pseudonym (or many) is to stay more anonymous than people who publish under their own name, there isn't a lot of publicly available information about her. I know she's American, and I know she has pretty typical hobbies (knitting, for example).
So we'll have to let her writing speak for itself later this week! We'll be reading the first book in the Stardoc series.