About 90,000 people are diagnosed with a brain tumor every year in the United States, according to the American Brain Tumor Association . Fifteen-year-old Walker was one of them.

The New York teenager was diagnosed with medulloblastoma , a malignant tumor that primarily affects children, after a routine visit to the eye doctor just after he finished kindergarten. He's in remission now, but the cause still remains close to his heart.

That's why he decided to organize a baseball game fundraiser in support of children battling brain cancer — just in time for Brain Cancer Awareness Month in May. The event raised over $25,000.

"I used to play baseball before my surgery, and I attend [ Poly Prep Country Day School ], which has the best baseball program in the northeast," Walker said on

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