Karen L. Hellekson (born 1966)[1] is an American author and scholar who researches science fiction and fan studies. In the field of science fiction, she is known for her research on the alternate history genre, the topic of her 2001 book, The Alternate History: Refiguring Historical Time, and has also published on the author Cordwainer Smith. In fan studies, she is known for her work on fan fiction and the culture of the fan community. She has co-edited two essay collections on fan fiction with Kristina Busse, and in 2008, co-founded the academic journal, Transformative Works and Cultures, also with Busse.