Thomas Edmund Gleisner AO (born 24 October 1962) is an Australian comedian, television presenter, producer, director, writer, occasional actor and author.

His best-remembered performances in The Late Show included the newsreader of Late Show News, the co-host of Countdown Classics with Jane Kennedy and the interviewer of stuntman Rob Sitch in Shitscared, although he appeared in various other sketches (including a recurring role as brainless bush-traveller "Wallaby Jack").

After The Late Show finished, Gleisner co-founded Working Dog Productions, along with Santo Cilauro, Jane Kennedy and Rob Sitch.

In 1995, Gleisner starred as mute cop Poncho on Funky Squad on ABC, another Working Dog comedy which he co-created and served on as a writer/producer/directors.

The series comprises the Eastern Europe send-up of Molvanîa: A Land Untouched by Modern Dentistry, parody of Southeast Asian destinations Phaic Tăn: Sunstroke on a Shoestring, and Central American send-up San Sombrèro: A Land of Carnivals, Cocktails and Coups.

[3] He is also passionate about raising autism awareness, co-founding Learning For Life, a centre that provides early intervention to autistic children, with his wife in 2004.