Kálmán Seinfeld was Jerry Seinfeld's father.

Kálmán was born on October 20, 1918 in New York to Hungarian-Jewish immigrant parents.

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Kálmán worked as a sign maker in New York City, a career that likely influenced Jerry's comedic sensibilities growing up.

Kálmán served in the U.S.

Army during World War II, where he collected many jokes and stories that he would later share with his son Jerry.

Jerry Seinfeld was born on April 29, 1954 in Brooklyn, New York to Kálmán and his wife Betty (née Hosni), who was of Syrian-Jewish descent.

Growing up, Jerry spent a lot of time listening to his father Kálmán's jokes and observational humor, which helped shape Jerry's own acclaimed comedic style later in life.

Kálmán's influence can be seen in the character of Morty Seinfeld, Jerry's father on the hit TV show "Seinfeld", who was initially played by another actor but later recast to better match Kálmán's persona.

After retiring from the sign making business, Kálmán became a frequent audience member at Jerry's comedy shows, offering feedback and encouragement to his successful son.

Kálmán Seinfeld passed away in 1985 at the age of 66, but his legacy as a key influence on Jerry's comedy career lives on through the character of Morty and Jerry's own reflections on his father.

Interestingly, the name "Kálmán" has Hungarian origins and is derived from the name of the 11th century King of Hungary, Coloman the Bookish.

While Jerry Seinfeld's comedy focuses on the mundane details of everyday life, his father Kálmán's background as a sign maker and war veteran brought a unique perspective that Jerry incorporated into his material.

Some of Jerry's most famous bits, like the "two-face" bit about people's public and private personas, were inspired by observations Kálmán shared with his son over the years.

The Seinfeld character of Morty was known for his gruff yet endearing personality, traits that were directly influenced by Kálmán's real-life mannerisms and interactions with his famous son.