Question: Kenny Warren and Jerry Seinfeld are Americans that have which occupation in common?

Context articles: Jerry Seinfeld (character)
Jerry Seinfeld
The Adventures of Seinfeld &amp; Superman
The Statue (Seinfeld)
The Apartment (Seinfeld)
I'm Telling You for the Last Time
Kenny Warren
The Phone Message
Mario Joyner
List of Seinfeld episodes

Jerome "Jerry" Seinfeld is the protagonist of the American television sitcom "Seinfeld" (1989–1998).
 The straight man among his group of friends, this semi-fictionalized version of comedian Jerry Seinfeld was named after, co-created by, based on, and played by Seinfeld himself.
 The series revolves around Jerry's misadventures with his best friend George Costanza, neighbor Cosmo Kramer, and ex-girlfriend Elaine Benes.
 He is usually the voice of reason amidst his friends' antics and the focal point of the foursome's relationship.
Jerome Allen "Jerry" Seinfeld ( ; born April 29, 1954) is an American comedian, actor, writer, producer, and director.
The Adventures of Seinfeld & Superman was a pair of advertisement films promoting American Express, featuring Jerry Seinfeld as himself and Patrick Warburton (who appeared with Seinfeld on "Seinfeld", as David Puddy) as the voice of Superman.
 The two films, "A Uniform Used to Mean Something..." and "Hindsight is 20/20", each about five minutes in length, were directed by Barry Levinson.
 In addition to being on the Internet, they aired on television during 2004 and once on TBS in 2003.
 In addition to promoting American Express, the premise of the films were to show Seinfeld and Superman as friends, and much of the humor originated from the various situations the two found themselves in.
 For example, Superman is anticipating hooking up Seinfeld's TV to surround sound, despite the fact that he has super-hearing as Jerry points out.
"The Statue" is the sixth episode of the second season of the NBC sitcom "Seinfeld", and the show's 11th episode overall.
 In the episode, protagonist Jerry Seinfeld (Jerry Seinfeld) inherits some old possessions of his grandfather.
 One of these is a statue, resembling one that his friend George Costanza (Jason Alexander) broke when he was ten years old.
 When Jerry sees the statue in the house of Ray (Michael D. Conway), the man who cleaned his apartment, he believes Ray stole the statue.
 Jerry struggles to get back at Ray, as his friend Elaine Benes (Julia Louis-Dreyfus) is editing a book written by Ray's girlfriend.
"The Apartment" is the fifth episode of the second season of the NBC sitcom "Seinfeld" and the show's tenth episode overall.
 In the episode, protagonist Jerry Seinfeld (Jerry Seinfeld) gets his ex-girlfriend Elaine Benes (Julia Louis-Dreyfus) an apartment above his, but regrets this after realizing it might be uncomfortable living so close together.
 Meanwhile, Jerry's friend George Costanza (Jason Alexander) wears a wedding ring to a party to see what effect this will have on women.
I'm Telling You for the Last Time is a 1998 stand-up comedy special starring Jerry Seinfeld.
 The special aired live on HBO on August 9, 1998 from the Broadhurst Theatre in New York City.
 It was then released as an album by the same title, and a VHS and DVD titled "Jerry Seinfeld: I'm Telling You for the Last Time - Live on Broadway".
Kenny Warren (born April 1, 1946) is an American Ventriloquist, Comedian, Author.
 He has appeared on television shows such as What’s My Line and To Tell The Truth and also has performed with comedians such as Jerry Seinfeld and Rodney Dangerfield.
"The Phone Message" is the ninth episode of the NBC sitcom "Seinfeld", and the fourth of the show's second season.
 The episode concerns protagonist Jerry Seinfeld (Jerry Seinfeld) dating a woman who likes a commercial for cotton Dockers he dislikes.
 Meanwhile, his friend George Costanza (Jason Alexander) leaves an obnoxious message on the answering machine of his girlfriend, and goes to great lengths to prevent her from hearing it.
Mario Joyner (born October 3, 1961) is an American stand-up comedian best known as the host of MTV's "Half Hour Comedy Hour" from 1988–1992.
 He is a longtime friend and collaborator of comedians Chris Rock and Jerry Seinfeld.
 He appeared regularly on "The Chris Rock Show" and "Everybody Hates Chris".
 He also guest starred in the "Seinfeld" episodes "The Engagement" and "The Puerto Rican Day," playing two different characters, and voiced the character Jackson in the film "Bee Movie".
 He has opened on national tours for Chris Rock (during his "No Apologies" tour) and for Jerry Seinfeld.
"Seinfeld" is an American television sitcom created by Jerry Seinfeld and Larry David.
 "Seinfeld" is a "show about nothing," similar to the self-parodying "show within a show" of fourth-season episode "The Pilot."
 Jerry Seinfeld is the lead character and played as a fictionalized version of himself.
 Set predominantly in an apartment block on New York City's Upper West Side, the show features a host of Jerry's friends and acquaintances, which include George Costanza, Elaine Benes, and Cosmo Kramer, who are portrayed by Jason Alexander, Julia Louis-Dreyfus, and Michael Richards, respectively.