He is the author of Spoon River Anthology, The New Star Chamber and Other Essays, Songs and Satires, The Great Valley, The Serpent in the Wilderness, An Obscure Tale, The Spleen, Mark Twain: A Portrait, Lincoln: The Man, and Illinois Poems.

In all, Masters published twelve plays, twenty-one books of poetry, six novels and six biographies, including those of Abraham Lincoln, Mark Twain, Vachel Lindsay, and Walt Whitman.

His epitaph includes his poem, "To-morrow is My Birthday" from Toward the Gulf (1918): "Good friends, let's to the fields ... After a little walk, and by your pardon, I think I'll sleep.

[8] Masters first published his early poems and essays under the pseudonym Dexter Wallace (after his mother's maiden name and his father's middle name) until the year 1903, when he joined the law firm of Clarence Darrow.

Years later, he wrote a memorable and invaluable account of the book's background and genesis, his working methods and influences, as well as its reception by the critics, favorable and hostile, in an autobiographical article notable for its human warmth and general interest.

[9] Although he never matched the success of Spoon River Anthology, he published several other volumes of poems including Book of Verses in 1898, Songs and Sonnets in 1910, The Great Valley in 1916, Song and Satires in 1916, The Open Sea in 1921, The New Spoon River in 1924, Lee in 1926, Jack Kelso in 1928, Lichee Nuts in 1930, Gettysburg, Manila, Acoma in 1930, Godbey, sequel to Jack Kelso in 1931, The Serpent in the Wilderness in 1933, Richmond in 1934, Invisible Landscapes in 1935, The Golden Fleece of California in 1936, Poems of People in 1936, The New World in 1937, and More People in 1939.