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Lorrah
Jean Lorrah is an American science fiction and fantasy author. She has produced several Star Trek novels, frequently with her writing and business partner Jacqueline Lichtenberg. Her most recent work with Lichtenberg is on the Sime~Gen Universe. Her 1980s fantasy series The Savage Empire is mostly solo work.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

The Vulcan Academy Murders
1991
ISBN 9780671742836
Idic Epidemic (classic Star Trek 38)
1989
ISBN 9780671707682