[1] Thomsen's first writing credit for a television series was on the CBS crime-drama Close to Home.
[2] Thomsen was a staff writer on the Fox science-fiction series Terminator: The Sarah Connor Chronicles.
Following its cancellation, he joined The CW drama reboot Melrose Place and wrote 3 episodes of its only season.
[3] He wrote the third episode of the HBO science fiction show Westworld with Lisa Joy.
[5] The show was nominated for best "Drama Series" screenwriting in the 69th Writers Guild of America Awards.