He’s running Boston ‘for every child fighting for more tomorrows’
William Mitchell is supporting Boston Children's Hospital, where his cousin received treatment for brain cancer.
In our “Why I’m Running” series, Boston Marathon athletes share what’s inspiring them to make the 26.2-mile trek from Hopkinton to Boston. Looking for more race day content? Sign up for Boston.com’s pop-up Boston Marathon newsletter.
Name: William Mitchell
Age: 30
City/State: Andover, Mass.
Running the 2025 Boston Marathon is personal for me because I’m running in support of Boston Children’s Hospital, where my cousin Rosie has received lifesaving care for the past four years.
In May 2021, Rosie was a high school senior preparing for college. Just days after her prom, she collapsed in her mother’s arms. She was rushed to the ICU, unable to move, speak, or communicate. Eventually, she was diagnosed at Boston Children’s with one of the rarest and most aggressive forms of brain cancer: DLGNT.
Since then, Rosie has endured multiple surgeries, relentless chemotherapy and radiation, months in the ICU, and unimaginable isolation. And yet, she’s still here, defying every odd with fierce strength and grace. Every extra moment with her is a gift, and Boston Children’s has played a critical role in making those moments possible.
As I train for the marathon before and after work, my team at Schneider Electric has been cheering me on. That support, along with the incredible care Rosie receives at Boston Children’s, keeps me moving forward. Every mile I run is for Rosie and to raise funds that help children like her access cutting-edge treatments and compassionate support.
Running Boston is an honor. Running it for Rosie — and for every child fighting for more tomorrows — gives every mile deeper meaning.
Editor’s note: This entry may have been lightly edited for clarity or grammar.
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