Cleveland Cavaliers owner Dan Gilbert is channeling his grief into a multi-million dollar medical mission after losing his oldest son, Nick, to neurofibromatosis in 2023.
This rare genetic condition causes benign tumors to develop along nerve tissue throughout the human body.
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The Rocket Companies chairman currently allocates roughly $50 million every year through the Gilbert Family Foundation toward neurofibromatosis research.
The disorder is highly prevalent among rare conditions, impacting approximately 1 in 2,000 American births and affecting nearly 170,000 citizens across the country.
Nick developed his inaugural tumor on his optic nerve shortly after birth, leading to regular chemotherapy and a major operation on his 10th birthday.
Despite enduring subsequent radiation, surgeries, and breathing impairments, he successfully attended Michigan State University and interned for his father's business development unit.
"The first one was on his optic nerve, between his eye and his brain," said Dan Gilbert, Owner, Cleveland Cavaliers.
"It wasn't growing for the first five years, until he was close to six years old, and then it started growing."
The billionaire executive remembered how his son maintained an optimistic demeanor and a sharp sense of humor during his childhood hospitalization.
"[Nick] just wanted to know if there was macaroni in the hospital," said Gilbert.
The family continuously believed that Nick would overcome his physical medical obstacles during his extensive clinical journey.
"He always believed that he was going to get through all this. And so did we," said Gilbert.
By 2018, the non-cancerous tumors expanded aggressively near his brainstem, stripping away Nick's final capability to speak, hear, or see before his death.
"There were some tumors, that just kind of got away from us," said Gilbert. "We had two major surgeries that year.
And from that point on, until 2023 when we lost him, there were just surgeries and chemo."
Gilbert noted that while these growths were technically benign, their rapid physical development caused immense structural bodily damage.
"These weren't cancerous tumors. They're benign, but they can grow and cause all kinds of damage," said Gilbert.
Losing his son, who was his best friend and a bow-tie wearing fixture at Cavaliers games, devastated Gilbert amid other personal hardships, including a 2019 stroke and a recent divorce.
"He was loved by everybody. Everybody that met him loved him.
He loved everybody," said Gilbert.
The billionaire expressed the profound helplessness of being unable to save his son despite possessing massive financial resources and medical access.
"That's a sobering thing," said Gilbert.
"You can't fix everything, so you just try to take one step in front of the next, do the best you can."
Gilbert stated that he chooses to actively focus on areas of life where he can still maintain personal agency and control.
"I mean, when you're dealt a card, like I was dealt with the stroke or my son, you just have to get the next card and try to play it ...
I mean things you can't control. So you work on the things you try to control," said Gilbert.
To preserve Nick's memory, his siblings launched a non-profit called The Gilly Project, while the family opened an upscale sports bar called Gilly's Clubhouse in Detroit.
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"We raised $12 million in one night. We keep breaking records.
We're contributing about $50 million a year to research," said Gilbert.
Beyond his philanthropy, Gilbert's active leadership style recently impacted the Cleveland Cavaliers' roster utilization during the 2026 NBA postseason.
On May 17, 2026, the Cavaliers defeated the top-seeded Detroit Pistons 125-94 in Game 7 of the Eastern Conference Semifinals following strategic advice from the owner.
Cavaliers head coach Kenny Atkinson revealed that Gilbert visited his hotel for dinner the night before the game to highlight center Jarrett Allen as the roster's crucial spark plug.
"He came over to our hotel and he goes, 'You know who the key to this whole thing is?'"
said Kenny Atkinson, Head Coach, Cleveland Cavaliers. "I was thinking [James] Harden, [Donovan] Mitchell.
He goes, 'The key to the whole thing, the spark, is Jarrett Allen.'"
The strategic insight paid off as Allen scored a career playoff-high 23 points, grabbed seven rebounds, and anchored the interior defense.
"Sometimes you have to be reminded," said Atkinson. "And that was great by Dan.
He hit it on the head. He was prophetic."
All-Star guard Donovan Mitchell praised Allen's consistent performance throughout his career in Brooklyn and Cleveland following the blowout road victory.
"I joked with him, I was like, 'Man, this is who you are now.
It's Black History Month JA and Game 7 JA,'" said Donovan Mitchell, Player, Cleveland Cavaliers. "But, on a serious note, this is just who he is.
He's been phenomenal for us ever since I got here, even before I got here. He's been phenomenal in Brooklyn."
Mitchell emphasized that Allen ignores outside critics and focus narratives by simply remaining true to his style of play.
"I'm glad people are starting to see who he really is, and who he is not just to us as a team but who he is in the NBA," said Mitchell.
The center previously faced public criticism regarding the intensity of postseason basketball after past games against the New York Knicks.
"The narratives are going to be the narratives," said Mitchell.
"There's always going to be something, and I think for him just to continue to be himself the entire time, he didn't come out and say, "Man, I got to find a way to get this off my back.'
No, it was like, 'I'm just going to be the same JA.'"
When asked to choose between Allen and other legendary clutch postseason performers, Mitchell strongly supported his teammate.
"I mean, Game 7 JA," said Mitchell. "Come on — he's two-for-two."
The victory advanced Cleveland to the Eastern Conference Finals without LeBron James on the roster for the first time since 1992.
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The Cavaliers opened their next playoff series on the road against the New York Knicks at Madison Square Garden.
