Company: Roper Growers Cooperative
Location: Winter Grove, Fla.
Founded: 1858
Employees: Varies by season
Revenue: Undisclosed

For almost 40 years, Roper has served as president of Roper Growers Cooperative, the family orange-growing business founded by his grandfather in the 1850s. In the 1980s, Roper revolutionized the citrus world with his Tree-See Control System for chemically spraying trees. These days, Roper has his hands in a number of entrepreneurial and environmental projects. He's helping an old Navy buddy develop a revolutionary X-ray machine, investing in technology to clean up polluted lakes, and constructing the "greenhouse of the future" for his town's first green building.