John Joannopoulos: key obituary facts
Is John Joannopoulos dead? Yes. John Joannopoulos died on August 19, 2025, at age 78.
Cause of death: John Joannopoulos's cause of death has not been publicly confirmed.
What was John Joannopoulos known for?
He was known as American physicist and academic.
American physicist and academic
Died on Tuesday August 19th 2025