20th Century Fox Television is a television-production studio owned by Walt Disney Television, a division of The Walt Disney Company. 20th Century Fox Television is responsible for producing The Simpsons, along with Gracie Films and The Curiosity Company.
The logo can be seen on The Simpsons airings on Fox. Airings on FX or FXX use the 2013-present 20th Television logo instead. Several episodes from the first three seasons have the original 1988 20th Television Fox logo preserved on DVD and VHS, though many of them are replaced by the 1993 20th Television logo with the bylineless on it, and as such are lost.