Meet Leslie Knipfing, the quiet powerhouse behind comedy giants Kevin James and Gary Valentine. Born November 17, 1974, in Mineola, New York, this Kevin James sister chose charity work over cameras. While her brothers light up screens with The King of Queens laughs, Leslie pours her heart into the JVK Foundation, fighting Retinitis Pigmentosa and helping families in need. At 51, she guards her private life fiercely—no social media, no red carpets. In this 2025 update, discover the real Leslie Knipfing net worth, her health journey, and why she’s the true hero of the Knipfing family.
Who Is Leslie Knipfing? Quick Bio and 2025 Profile Summary
| Detail | Information |
| Full Name | Leslie Knipfing |
| Date of Birth | November 17, 1974 |
| Age (2025) | 51 years old |
| Birthplace | Mineola, New York, USA |
| Nationality | American |
| Parents | Joseph Valentine Knipfing Jr. & Janet Knipfing |
| Brothers | Kevin James, Gary Valentine |
| Profession | Charity and fundraising |
| Known For | Kevin James sister, private life, JVK Foundation |
| Net Worth (2025) | About $1.5 – 2 million |
| Social Media | No social media |
| Marital Status | Private |
| Health | Possible Retinitis Pigmentosa (not confirmed) |
Leslie Knipfing is the only sister of Kevin James and Gary Valentine. She never wanted to act. She works hard for charity instead. JVK Foundation is close to her heart. In 2025, she runs more online events for eye health.
Leslie Knipfing 2025 stays strong and private. She helps people quietly. Her money comes from good work. She shows real success means helping others, not being famous.
Early Life and Family Background: Long Island Roots
Leslie Knipfing grew up in a happy Long Island family. Dad Joseph Valentine Knipfing Jr. owned an insurance business. Mom Janet Knipfing made the home warm and loving. The house always had laughs.
Brothers Kevin James and Gary Valentine joked around a lot. Leslie liked calmer things. She started helping people very young. Mineola New York celebrity family taught strong values. Those roots keep the Knipfing siblings close today.
How Old Is Leslie Knipfing? Age, Birthday, and Key Stats [2025]
Leslie Knipfing age is easy to know. She was born November 17 November 1974. That makes her 51 years old in 2025. She is the youngest sibling.
She stays out of the public eye completely. No social media. No paparazzi photos. Just family and charity work. That is real strength at 51.
Leslie Knipfing’s Parents: The Knipfing Family Legacy
Joseph Valentine Knipfing Jr. and Janet Knipfing built everything on love and hard work. Dad showed them how to run a business honestly. Mom showed how to care for people every day.
They never pushed fame. They said “be yourself.” That is why Leslie Knipfing private life feels so peaceful. The parents’ lessons still guide all three kids.
Her Brother Kevin James: From Sibling Rivalry to Hollywood Stardom
Kevin James is the middle brother everyone knows. He turned normal guy jokes into movies like Paul Blart: Mall Cop and Zookeeper. He made millions laugh for years.
Kevin always says family comes first. He thanks Leslie Knipfing for keeping him grounded. Their sibling love is super strong, even with Hollywood in the way.
5. Her Brother Gary Valentine: The Other Comedy Sidekick
Gary Valentine (real name Gary Knipfing) is the oldest brother. He acted with Kevin in The King of Queens and Kevin Can Wait. He also does great stand-up comedy.
Gary and Leslie stay super close too. They team up for charity sometimes. Funny guy with a big heart – just like the whole family.
Relationship with Kevin James and Gary Valentine: Bonds Beyond Fame
The Knipfing siblings are best friends forever. They have yearly private meet-ups in New York. No cameras, just real talks and laughs.
Kevin and Gary protect Leslie Knipfing private life. She supports them quietly. That kind of love money and fame can’t buy.
Career in Charity and Fundraising: Leslie’s Lasting Impact
Leslie Knipfing charity work is her true calling. She helps run events for JVK Foundation. The money goes to Retinitis Pigmentosa research and other health causes.
In 2025 she led online fundraisers that made over $60,000. She proves one person can change many lives. Quiet heroes like her deserve all the applause.
Indianapolis Vision Walk – White River State Park
Health Challenges, Personal Life, Privacy, and Common Confusions
Some say Leslie Knipfing health issues include Retinitis Pigmentosa. Family never confirmed it. If true, it explains her big work for eye disease causes.
She keeps marriage, kids, everything private. No social media. People mix her up with actress Leslie Bibb (not the same person!). Leslie just smiles and keeps doing good.
Leslie Knipfing Net Worth 2025: Financial Status, Current Life, and Where She Is Now
Leslie Knipfing net worth in 2025 is around $1.5 – 2 million dollars. Most comes from charity work and family support. Very different from Kevin’s $100 million.
She lives quietly in New York. Still runs fundraisers. Still mentors young people who want to help others. Her life is simple, beautiful, and beautiful.
Who Is Leslie Knipfing? Kevin James’ Sister and Her Private Life Explained [2025 Update] shows us the best kind of success – the kind that helps people and stays humble. Leslie, you are awesome!
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