Dr. Juliet Michelle Daniel, renowned cancer biologist, mentor, institution-builder and the first Black female scientist ever appointed by McMaster University, died of metastatic breast cancer on 28 April 2026, in Hamilton, Ontario. She was 61.
Daniel was the first to discover a new gene that would become central to understanding one of the deadliest forms of breast cancer affecting Black women.
The bare facts of her career are formidable enough: more than 4,000 citations, a quarter-century of landmark research into triple-negative breast cancer, a procession of organizations she co-founded and causes she advanced by sheer insistence.
But to tell the story only through her résumé would miss the thing everybody remembers first: the force of her presence. The phone calls at midnight. The booming laugh. The way she could challenge you intellectually one minute, then make you feel completely at ease the next. To colleagues, she was Dr. Daniel. To friends, Juliet. To a trusted few, Jules.
