<human>:  Who is the author of the article ‘Converting a forest to pasture’?
<bot>: That would be a book by John Muir, called “My First Summer in the Sierra”. Muir was an American naturalist and author. He is best known for his advocacy of preservation of natural areas, especially in the Sierra Nevada mountains of California. He is also known for his contributions to the preservation of Yosemite National Park.