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17 Famous People With Klinefelter Syndrome or Marfan Syndrome

17 Famous People With Klinefelter Syndrome or Marfan Syndrome

Klinefelter syndrome (47, XXY) is a condition which occurs in men who have an extra X chromosome, resulting in an XXY sex chromosome karyotype.

The syndrome can affect different stages of the language, physical, and social development. It is estimated that 3,000 affected boys are born each year in the US.


The signs and symptoms of KS in young boys and teenagers may include:

  • a quiet character;
  • tall stature (short torso, long legs, and broader hips);
  • shyness;
  • small penis;
  • fatigue;
  • small, firm testicles;
  • weak bones;
  • gynecomastia (enlarged breast tissue).

Note – since KS can be hard to notice, many parents don’t know their child has the syndrome until he shows delays in puberty.

People who have KS have an increased risk for autoimmune disorders, like – rheumatoid arthritis, lupus, and Sjogren’s syndrome. Also, the syndrome is linked with an increased risk for breast cancer, varicose veins, lung disease, extragonadal germ cell tumor, and osteoporosis.


Testosterone therapy can help sufferers with many of the symptoms of KS, but the treatment should start at puberty.

Marfan Syndromehuman body

Marfan syndrome is an inherited disease which affects the body’s connective tissue, that provides the support, strength, and elasticity to blood vessels, cartilage, heart valves, tendons, and other important parts of the physical body.

This autosomal dominant condition occurs once in every 10,000 to 20,000 people. It is named after Antoine Marfan, a French doctor who first described the syndrome in 1896.

If you have MS, you have a 50:50 chance of passing on the condition to each of your children.


Common symptoms may include:

  • backward flow of blood through the aortic and mitral valves;
  • floppiness of the mitral valve;
  • tear (dissection) and widening (aneurysm) of the main artery;
  • nearsightedness (myopia);
  • dislocation of the lenses of the eyes (ectopia lentis);
  • protrusion of the chest wall (pectus deformity);
  • an abnormal side-to-side curvature of the spine (scoliosis);
  • overgrowth of the long bones of the legs and arms.
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Note – because of the high degree of variability of the syndrome, many of these clinical characteristics can be present at birth or they can manifest later in childhood.


It can be difficult to diagnose since many sufferers have only a few typical symptoms and no specific biochemical or histologic changes.

List of Celebrities, Actors, and Other Famous People With Klinefelter Syndrome or Marfan Syndrome:

1) Austin Carlile

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He was born on September 27, 1987, in Ohio, and is best known as the former lead vocalist of the bands ”Attack Attack!” and ”Of Mice & Men.”

In 2005, Austin formed Call It Even with his high school friends. 

Austin is undergoing a long procedure to battle the effects of Marfan syndrome.

2) Jamie Lee Curtis

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She is an American big screen and television actress who headlined the films ‘A Fish Called Wanda,’ ‘Halloween,’ and ‘True Lies.’

It is thought that she has Klinefelter syndrome. Also, there is evidence which supports the assertion that Curtis has androgen insensitivity syndrome.

3) Lou Ferrigno

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He is an American actor, fitness trainer/consultant, and motivational speaker who gained his nickname after becoming the first actor to be cast as ”The Incredible Hulk.”

As a baby, Lou was diagnosed with a permanent hearing loss. Some also believe that he has Klinefelter syndrome.

4) Brooke Moore

Originally named Bradley, she was assigned the male gender at birth and went to an all-boys school. Eventually, Moore was diagnosed with Klinefelter syndrome.

5) Ron Perlman

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He is an American actor widely famous and acclaimed for his role in ”Hellboy” as well as for playing Biker Clay in ”Sons Of Anarchy.”

In an interview with The Daily Beast, Ron Pearlman opens up on topics ranging from his attempted suicide to his “fat kid” adolescence.

According to some sources, he shows some signs of Klinefelter syndrome.

6) Peter Mayhew

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Peter earned a place in cinematic history for his role as Chewbacca in the Star Wars franchise.

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He was also diagnosed with Marfan syndrome.

7) Niccolo Paganini

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He was a renowned Italian violinist and composer of the 19th century who is best remembered for his ”24 Caprices for Solo Violin Op 1,” that he wrote between 1802 and 1817.

The American Schonfeld was the first to advance the theory that Niccolo Paganini was affected by the Marfan syndrome.

8) Troye Sivan

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He is a singer and actor of Australian origin, born in 1995. Troye Sivan started off as a singer in 2006 and in 2008 he released his first original music album.

Sivan is also quite popular on social media, including Instagram (where he has more than 7 million followers) and YouTube (where his audience includes over 6.2 million people).

Troye suffers from a mild form of Marfan syndrome.

9) Isaiah Austin

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He is an American basketball player who played two years of college basketball for Baylor University. Moreover, Isaiah had been considered a first-round prospect in the 2014 NBA draft.

On June 22, 2014, Isaiah had been diagnosed with Marfan syndrome.

10) Caster Semenya

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She is a South African middle-distance runner and 2016 Olympic gold medalist.

Also, at the 12th IAAF World Athletic Championships in Berlin, Caster won the 800m race in a best personal time of 1.55.45 seconds.

However, controversy surrounds Semenya due to her somewhat masculine appearance.

Some believe this is because of her Klinefelter syndrome.

11) Vincent Schiavelli

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Vincent was an actor that had made over 120 television and film appearances.

He was also selected in 1997 by Vanity Fair as one of the best character actors in the United States.

Schiavelli was diagnosed with Marfan syndrome.

In addition, he worked at the national conference helping teens with MS, whom he called his “genetic brothers and sisters.”

He died of lung cancer at age 57 in Italy.

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12) Michael Phelps

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He was born to Deborah Sue ‘Debbie’ and Michael Fred Phelps in Baltimore, Maryland.

Phelps won 6 gold medals at the 2004 Olympics, 8 gold medals at the 2008 Olympics, and 4 gold medals at the 2012 Olympics.

He is the most celebrated athlete and the most decorated Olympian ever in the history of the sports.

It was rumored that Michael Phelps has MS and became a truth when Phelps himself confirmed having the syndrome. However, he tested negative for it.

13) Tom Sizemore

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Sizemore is an American television and film actor and producer who is known for his roles in films like – Pearl Harbor, Saving Private Ryan, Black Hawk Down, and Heat.

In 2013, he was told to leave a Utah film set after an 11-year-old actress told her mother that he had touched her genitals.

It is also thought that he has KS.

14) Sergei Rachmaninoff

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He was a composer and the last great figure of the Russian Romanticism tradition.

The size of his hands may have been a manifestation of MS.

However, he did not clearly exhibit any of the other clinical features typical of the syndrome.

15) Robert Johnson

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He was an American blues guitarist, composer, and singer whose masterful, rhythmic slide guitar and eerie falsetto voice influenced many rock and blues musicians.

Based on pictures and contemporary accounts, he probably had the Marfan syndrome.

16) Bradford Cox

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For nearly 15 years, Bradford Cox has been the frontman of Deerhunter, a band from Atlanta.

His skinny 6-foot 4-inch frame is a result of MS.

17) Arik Einstein

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He was a vocalist for Shleeshiyat Gesher Hayarkon (Yarkon Bridge Trio), Batzal Yarok (Green Onion), and Hahalonot Hagvohim (The High Windows).

Arik had MS. He died at the age of 74 at Ichilov Hospital in Tel Aviv, a few hours after he suffered a fatal hemorrhage.


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