Marcus Baker (September 23, 1849 – December 12, 1903) was an American naturalist, explorer of Alaska, journalist, and newspaper editor.
In 1872, he was hired by William Healey Dall to be a naturalist on an expedition to Alaska, where he collected topographic and hydrographical data.
He was one of the 15 original signers of the articles of incorporation for the National Geographic Society in 1888.
Mount Marcus Baker in the Chugach Range of southern Alaska is named after him.
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