David Baltimore Cause of Death: David Baltimore Obituary

 At his home in Woods Hole, Massachusetts, David Baltimore, a pioneering molecular biologist who directed Caltech and shared the 1975 Nobel Prize for discovering reverse transcriptase, passed away on September 6, 2025. At the age of 87, he passed away due to complications from multiple malignancies.

Born in New York City on March 7, 1938, Baltimore graduated from Swarthmore College with a degree in chemistry in 1960 and Rockefeller University with a Ph.D. in 1964. His early work at MIT and the Salk Institute prepared him for his career-long interest in viruses.

By discovering reverse transcriptase, an enzyme that allows RNA viruses to replicate their genetic material into DNA, at MIT in 1970, he challenged a fundamental tenet of molecular biology. The finding served as the foundation for contemporary virology and cancer biology, and it earned Howard Temin and Renato Dulbecco a share of the 1975 Nobel Prize in Physiology or Medicine.

Baltimore was a significant leader in science. In addition to leading Caltech from 1997 to 2006, he was the founding director of the Whitehead Institute at MIT starting in 1982 and president of Rockefeller University from 1990 to 1991. Later on, he was the American Association for the Advancement of Science's president and chair.

Baltimore also contributed to the development of new biology's ethics. He was one of the organizers of the Asilomar meeting in 1975, which produced groundbreaking safety standards for research involving recombinant DNA. He still offered his opinions on appropriate biotechnology decades later.

His notoriety attracted attention. Baltimore quit the Rockefeller presidency and eventually returned to MIT after a long-running scientific misconduct dispute based on a coauthored 1986 work. Baltimore was judged not to have engaged in any misconduct. He later became the head of Caltech and continued to play a major role in science.

A fundamental notion in virology, Baltimore's "Baltimore classification" classifies viruses according to their mRNA-generating mechanisms. Together with formal taxonomy, the scheme is still taught all around the world.