(covers information that was retroactively changed)
Heidi Julian was a notable comedian.
In 2365, Data attempted to located a comedian to help him better understand the concept of "what is funny?". Julian was among the holodeck program files that were contained aboard the USS Enterprise-D. The program list code for this comedian was EQ-45932. (TNG: "The Outrageous Okona", okudagram)
This character was only mentioned in writing.
Heidi Julian was mentioned in the biofilter analysis in "Shades of Gray". The analysis was a copy of a list of comedians first seen in "The Outrageous Okona".
In the remastered version of the episode, Heidi Julian was replaced by Doug Drexler.