Born in 1873, Oliver R. Barrett began collecting autographs and historical documents in his boyhood in Pittsfield, Illinois, by simply writing to celebrities and politicians, asking for their signatures. He taught himself how to set type and then distributed circulars reading "Wanted, Letters of Famous Men." By age seventeen Barrett was advertising in weekly county newspapers for autographs and documents, particularly for items relating to Abraham Lincoln such as letters, tokens, handbills, newspapers and any other miscellany. Having grown up among people who talked about the Civil War and President Lincoln from firsthand experience, Barrett developed a passion for acquiring Lincolniana that eventually resulted in one of the largest and finest private Lincoln collections of the twentieth century.

Eschewing his family's hopes for becoming a farmer or a preacher, Barrett instead chose to go to the law school of the University of Michigan, from which he graduated in 1896. After at first practicing law in Peoria, he enlisted in the 5th Illinois Infantry for a short time during the Spanish-American War, and then settled down to live in Kenilworth, Illinois, to continue what would be his life-long legal career in Chicago.

Barrett's interest in Lincoln became an obsession and as he became widely known as a collector, his collection was used extensively by Lincoln scholars, including Carl Sandburg. He also was Sandburg's lawyer, and they became friends through their mutual enthusiasms. Barrett wrote one book: Lincoln's Last Speech in Springfield in the Campaign of 1858 (1924), and later his son Roger, also a lawyer, wrote a brochure entitled "A Strange Affair," which dealt with a mysterious crime Lincoln described in a letter to his friend Joshua Speed.

Oliver Barrett and Carl Sandburg met in 1924. The year before Barrett's death in 1950, Sandburg published the volume, Lincoln Collector: The Story of the Oliver R. Barrett Lincoln Collection, a lengthy project he claimed he wouldn't have undertaken were it not that Barrett has been his counsel and friend for so many years. Barrett's short obituary states: "Mr. Sandburg, a life-long friend of Mr. Barrett, had obtained documentation of many of his works from him."

Carl Sandburg was born in Galesburg, Illinois in 1878. The son of poor parents, Sandburg left school at thirteen and until he managed to go to Lombard College, he worked as an unskilled laborer, rode the rails and even served for eight months with the 6th Illinois Infantry in Puerto Rico. He began writing poetry in college, but with his formal education over he began selling Underwood and Underwood stereoscopic pictures, then turned to newspaper work, first in Milwaukee and then in Chicago. He was hired as an editorial writer on the Chicago Daily News and became part of the "Chicago Group" which included Ben Hecht, Charles McArthur, Floyd Dell and others.

From his youth, Sandburg idolized Abraham Lincoln, and his six-volume definitive biography of Lincoln is still considered one of his greatest achievements. He continually published poetry, as well as stories for children. and was always in great demand as a performer, touring the country with a banjo or guitar, singing folk songs and reciting his poems. Sandburg's one novel, Remembrance Rock, written in 1948, was not particularly successful but when he died in 1967, his important place in American letters was nevertheless assured.