question: Who has written the biography of Meriwether Lewis (August 18, 1774 – October 11, 1809) was an American explorer, soldier, politician, and public administrator?
answer: Stephen Ambrose
context: Title: Meriwether Lewis
  Passage: Meriwether Lewis (August 18, 1774 – October 11, 1809) was an American explorer, soldier, politician, and public administrator, best known for his role as the leader of the Lewis and Clark Expedition, also known as the Corps of Discovery, with William Clark.
  Title: USS Lewis and Clark (SSBN-644)
  Passage: USS "Lewis and Clark" (SSBN-644), a "Benjamin Franklin" class ballistic missile submarine, was the first ship of the United States Navy to be named for the explorers Meriwether Lewis (1774–1809) and William Clark (1770–1838), who carried out the Lewis and Clark Expedition of 1804–06.
  Title: Undaunted Courage
  Passage: Undaunted Courage: Meriwether Lewis, Thomas Jefferson, and the Opening of the American West (ISBN  ), written by Stephen Ambrose, is a 1996 biography of Meriwether Lewis of the Lewis and Clark Expedition.  The book is based on journals and letters written by Lewis, William Clark, Thomas Jefferson and the members of the Corps of Discovery.  While most of the book is dedicated to the expedition, several chapters are also devoted to Lewis's early life as a Virginia planter and Jefferson's personal secretary, and his later life as governor of the Louisiana Territory before his untimely death in 1809.
citations: Undaunted Courage Meriwether Lewis