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|Occupation||Actor, voice-over artist|
|Years active||1984 – present|
John Hasler is an English actor and voice-over artist who appeared as T-Shirt in the children's TV series T-Bag from 1985–92. Hasler was the only character to remain with the show for its entire television run, starting as a young boy and leaving as a teenager.
From 2015 onwards, he is the voice of Thomas the Tank Engine in the UK and Rheneas in the UK and US narrations of Thomas & Friends Also, Hasler played the voice of main character Toot, in Toot the Tiny Tugboat.