Tatiana Schlossberg, granddaughter of JFK, has died of blood cancer at 35

• Tatiana Schlossberg, granddaughter of JFK and a climate journalist, has died at age 35.
• Schlossberg recently revealed her acute myeloid leukemia diagnosis in a New Yorker essay.
• "She will always be in our hearts," her family wrote in a post on Instagram.

Tatiana Schlossberg, a granddaughter of former President John F. Kennedy and a prominent climate activist and environmental journalist, died of cancer on December 30 at age 35, her family announced through a social media post.

"Our beautiful Tatiana passed away this morning," the post, signed by her family and posted to Instagram, read. "She will always be in our hearts."

Schlossberg, a mother of two young children, recently revealed in an essay for The New Yorker that she was diagnosed with acute myeloid leukemia shortly after her daughter's birth in May 2024.

The middle child of Caroline Kennedy and Edwin Schlossberg, Tatiana Schlossberg was a prominent advocate on climate issues. She was known for her book "Inconspicuous Consumption: The Environmental Impact You Don't Know You Have" and her work as a science and climate reporter for The New York Times until she left the paper in 2017.

She said in her essay that she was diagnosed with a rare form of blood cancer after doctors noticed her white blood cell count looked "strange." She was shocked by the diagnosis.

"I didn't feel sick," she wrote. "I was actually one of the healthiest people I knew. I regularly ran five to ten miles in Central Park. I once swam three miles across the Hudson River—eerily, to raise money for the Leukemia and Lymphoma Society."

Over the past year and a half, she received various cancer treatments, including chemotherapy, a bone-marrow transplant from her sister, and CAR-T immunotherapy.

In her November essay, she also spoke out against her cousin, Health and Human Services Secretary Robert F. Kennedy, Jr., whom she called an "embarrassment" to her family. As health secretary, Kennedy has cut research funding for mRNA vaccines that could be used to fight cancer, and sowed doubt about routine vaccines, which are critically important for cancer patients with weakened immune systems.

She is survived by her husband, urologist Dr. George Moran, toddler son Edwin, and a 1-year-old daughter.