Swim Across America’s two newest event directors, Leah Thomson and Zoe Treitman, both residents of Martha’s Vineyard, are only 17-years-old and high school juniors. Thomson and Treitman were inspired to launch a Swim Across America event on their own island of Martha’s Vineyard after seeing last year’s Swim Across America – Nantucket open water swim raise $1 million to fight cancer. They believed Martha’s Vineyard could do the same – or better! After all, there has always been a friendly competition between the neighboring islands. The fundraising goal for the swim in its first year is $200,000.

For Leah Thomson, the cause is deeply personal. She was four years old when her grandmother, Susan Parker, her mom Rebekah’s mother, was diagnosed with metastatic breast cancer and only five years old when her grandma passed away. Her great-aunt Aiko Nakamura also sadly lost her battle with cancer several years ago. Leah has other family members currently battling cancer and their fights have inspired her to jump in and help organize the swim in their honor. They include D.L., her grandfather’s second wife, who was diagnosed with lung cancer last year and is currently recovering well; her great-uncle Jonathan and great-aunt Ellie, who are each facing cancer diagnosis; and her long time tennis mentor, Jay Grossman, who sadly lost his battle with cancer this April. 

“I was inspired to get involved with Swim Across America for my Grammy, for family members who are facing cancer and for my dear friend and coach Jay Grossman,” said Leah Thomson. “Swimming is nothing compared to the challenges our loved ones with cancer face. By helping put on this event, I can help make a difference and swim for those who can’t – and with my community’s support, I know it will help make a significant impact on cancer care on our island.”

Leah also noted that leading the Swim Across America open water swim has also given her a meaningful way to turn a challenge into action. “Swim Across America has introduced me to an entire family of brilliant, loving and compassionate individuals and it has given me a way to play a small part in the fight against an awful disease that I have seen way too many people suffer from.”

Co-event director Zoe Treitman also has her own family’s experience with cancer that has fueled her commitment to the event. Her grandmother Leonora had colon cancer and lost her battle when Zoe was in second grade. She also has long been inspired by her grandfather Rick Treitman, who has participated in the Pan-Mass Challenge to raise money for cancer research.

“So many on Martha’s Vineyard and beyond are affected by cancer, and I want to help make their quality of life better – all while raising funds locally that stay local, supporting Mass General Brigham Cancer Institute Martha’s Vineyard Hospital here on the island,” said Zoe Treitman. “Cancer has taken so many of our loved ones, and we want to do all we can to fight it. I hope our community will come out and join us on Saturday, July 18, at Menemsha Beach and help us make waves to fight cancer!”

Rebekah Thomson, Leah’s mother, is playing a supporting role if needed, but is mostly there to proudly watch her daughter Leah and friend Zoe run the event.  “I’m really proud of the ambition that Leah and Zoe have to organize this event and their passion for making a difference,” said Rebekah. “To take on running a major event is a huge endeavor for anyone of any age, but for Leah and Zoe to just be 17, it is a major accomplishment. I’m here to support them and help guide them, if they need it, but they are already taking the reins and running with the tasks needed to manage and hold a successful fundraiser and sporting event.”

Nationally, Swim Across America has raised more than $150 million for cancer research since its founding in 1987 and has helped fund clinical trials that contributed to the FDA-approved cancer immunotherapy medications Keytruda, Opdivo, Yervoy and Tecentriq. In the past year, Swim Across America funded a breakthrough clinical trial at Memorial Sloan Kettering that showed that immunotherapy alone could successfully treat certain types of cancer. The organization also recently awarded two first-of-its-kind gene editing innovation grants to the Alliance for Cancer Gene Therapy and Dana-Farber Cancer Institute, advancing novel CRISPR gene and base editing techniques used in targeted therapies, immunotherapies and cellular therapies. Swim Across America supports more than 60 cancer research projects annually, has eight named Swim Across America labs, and supports work at many of the nation’s leading cancer institutions.

The inaugural Swim Across America – Martha’s Vineyard open water swim on Saturday, July 18, 2026, will be held at Menemsha Beach in Chilmark, Massachusetts, on the island of Martha’s Vineyard. The swim will raise funds for its local beneficiary Mass General Brigham Cancer Institute at Martha’s Vineyard Hospital and support cancer care on the island. Hundreds are expected to dive in and make waves to fight cancer, swimming at this iconic location. Swimmers, land and water volunteers (boaters, kayakers, stand up paddle boarders) are encouraged to register for this inspiring event. Those interested in participating can learn more and register at swimacrossamerica.org/marthasvineyard and follow on instagram or facebook @saamarthasvineyard.