The investigation into the Space Shuttle Challenger disaster was led by a commission headed by William P. Rogers, a former Attorney General of the United States. Richard Feynman, a renowned physicist, was a member of the commission and played a key role in uncovering the cause of the disaster.

While Feynman wasn't the sole figure responsible for solving the problem, his insightful experiments and analysis, including the now-famous "O-ring" demonstration, helped to expose the underlying flaw in the design of the solid rocket boosters.

Therefore, while not solely responsible, Feynman's contributions were crucial to understanding and ultimately revealing the cause of the Challenger disaster.