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|Family||Wife: Doris Klompus|
|First Appearance||"The Pen"|
|Last Appearance||"The Money"|
|Portrayed By||Sandy Baron|
Jack was a short tempered resident of the The Pines of Mar Gables Phase II condos in Florida and seemed to consistently have a grudge against Morty Seinfeld (Jerry Seinfeld's dad) and was the condo association vice-president under him. He was famous for shouting "Ahh!" while waving his hand down, which is often how he would end an argument with Morty.
He carried a Space Pen, the kind used by astronauts, which could write upside-down as seen in "The Pen." He showed it around and gave it to Jerry after the comedian complimented it, leading to consternation over whether it was a gift that should have been accepted. At the same time, Jack Klompus was the MC of an event that honors the condominium president. During the event, both of them get into a fight which results in Jack's dental plate getting broken as Jack vows to sue Morty. Morty and Jack continue their argument. Following the incident, Morty and Helen's neighbor Evelyn tells Helen and Morty that she can offer her nephew Larry to represent him in the case against Jack as he is a good lawyer.
In “The Raincoats,” Morty asked Jack to retrieve a box of leftover "Executive" raincoats from his garage and send them to him in New York. Because the garage was locked, Jack broke a window to get in, cutting his hand in the process. He neglected to fix the window, which allowed burglars to enter the Seinfelds’ home and rob them.
When Jerry bought his parents a Cadillac with the money he received for a show in Atlantic City as seen in "The Cadillac, Part 1," Jack was suspicious of Morty, thinking he stole the money from Del Boca Vista’s board of directors. Morty was president of the board and Jack among others voted to impeach him. The impeachment succeeded. In "The Cadillac, Part 2," Jack taunted Morty outside the restaurant stating that when Morty is impeached, he'll have plenty of time to drive around in his cadillac. Upon Mabel Choate remembering that Jerry was the one who mugged her for her marble rye upon Jack calling her an "old bag," she changed her vote from against impeachment to in favor of impeachment. As a result, Herb dismisses Morty and swears in Jack as the new condo president as part of the second constitution of The Pines of Mar Gables Phase II.
In "The Money," Morty and Helen Seinfeld ended up selling the Cadillac to Jack for $6,000 and tried to give the money to Jerry, who bought it back from Jack for $14,000. Jack proceeded to crash the car in Alligator Alley as he contacts Jerry about it where he even lost his astronaut pen. After handling the repairs for the Cadillac, Jerry had to sleep in it since Jack wouldn't let him stay over for the night. By the end of the episode, Morty and Helen bought the Cadillac back from Jack.