Which 19th-century American essayist, first name Henry, wrote "Walden"?

Which country singer recorded the 1999 duet "Written in the Stars" with Elton John? In 1999 Boris Yeltsin named which former KGB officer as his successor? In 1999's "Being John Malkovich", who plays the puppeteer who finds a portal into Malkovich's head? Which 19th-century actress, born Emilie Le Breton, was nicknamed "the Jersey Lily"? Which 19th-century author wrote the novel "Black Beauty"? Which 19th-century flag was nicknamed the "Stars and Bars"? Nathaniel Currier's famous 19th-century lithography firm partnered him with which man? Which 19th-century scientist's mother and wife both came from the Wedgwood pottery family?