John Mason was a notable comedian.
In 2365, Data attempted to create a comedian to help him better understand the concept of "humor". Mason was among the holodeck program files that were contained aboard the USS Enterprise-D, though Data's attempt was ultimately unsuccessful when the computer created a holographic "audience" that was programmed to laugh at literally anything – whether it was actually funny or not. the program list code for this comedian was ZB-45234. (TNG: "The Outrageous Okona")