Biography
There are at least 3 artists with that pseudonym:
(1) Damon Baxter a.k.a. Deadly Avenger produced two straight up electro EPs in '95 and '96 under the name Sem.
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(2) Semothy Jones, a British record producer.
(3) A dance act from Mental Madness Records.
(4) Electronic / Future Bass Producer from Netherlands.
He continued to release under the name Sem until 2020, and from around 2021 he has been active under the name who's sem. https://soundcloud.com/whosem
Biography text from Last.fm, available under CC BY-SA.