Peter Lewis | insurance executive, 80
Philanthropic adviser Jennifer Frutchy said Lewis died at his home in Coconut Grove, Fla.
Progressive president and CEO Glenn Renwick said the company owes its growth and its culture of openness to Lewis. He said Lewis' caring and honesty were bedrock values of the company.
Lewis became chief executive officer of Progressive in 1965, built from the company his father co-founded in 1937. Lewis held the leadership post for 35 years, during which Progressive - and Lewis' fortune - steadily grew. In 2006, Forbes calculated his net worth at $1.4 billion.
In a 2011 interview with Forbes Magazine, Lewis said he first tried marijuana at age 39. He said he found it to be "better than scotch" and later relied on it for pain management.
"I don't believe that laws against things that people do regularly, like safe and responsible use of marijuana, make any sense," he told Forbes. "Everything that has been done to enforce these laws has had a negative effect, with no results."