Jack Hardemeyer, played by Kurt Fuller, is a character in the film Ghostbusters II.
Hardemeyer is Mayor Lenny Clotch's assistant. Like Walter Peck, he is skeptical of the Ghostbusters' operations and tries to discredit them. After overstepping his authority and having the Ghostbusters committed to a psychiatric hospital under the pretense of protecting the mayor's political interests, Hardemeyer is then fired for his misconduct.
However, on Liberty Island, Hardemeyer is by the mayor's side again during him giving a Key to the City to the Ghostbusters, indicating that he got his job back.
In a deleted scene, it is revealed that he was originally supposed to be killed off by the mood slime, but it changed because it is too gruesome for a family comedy film.