quality:corruption
Early life and career

Sullivan was born to a Swiss-born mother, née Andrienne List (who had emigrated to Boston from Geneva with her parents and two siblings, Jenny, b. 1836, and Jules, b. 1841) and an Irish-born father, Patrick Sullivan. Both had immigrated to the United States in the late 1840s. He learned that he could both graduate from high school a year early and bypass the first two years at the Massachusetts Institute of Technology by passing a series of examinations. Entering MIT at the age of sixteen, Sullivan studied architecture there briefly. After one year of study, he moved to Philadelphia and took a job with architect Frank Furness.

The Depression of 1873 dried up much of Furness's work, and he was forced to let Sullivan go. Sullivan moved to Chicago in 1873 to take part in the building boom following the Great Chicago Fire of 1871. He worked for William LeBaron Jenney, the architect often credited with erecting the first steel frame building. After less than a year with Jenney, Sullivan moved to Paris and studied at the École des Beaux-Arts for a year. He returned to Chicago and began work for the firm of Joseph S. Johnston & John Edelman as a draftsman. Johnston & Edleman were commissioned for the design of the Moody Tabernacle, and tasked Sullivan with the design of the interior decorative fresco secco stencils (stencil technique applied on dry plaster). In 1879 Dankmar Adler hired Sullivan. A year later, Sullivan became a partner in Adler's firm. This marked the beginning of Sullivan's most productive years.

Adler and Sullivan initially achieved fame as theater architects. While most of their theaters were in Chicago, their fame won commissions as far west as Pueblo, Colorado, and Seattle, Washington (unbuilt). The culminating project of this phase of the firm's history was the 1889 Auditorium Building (1886–90, opened in stages) in Chicago, an extraordinary mixed-use building that included not only a 4,200-seat theater, but also a hotel and an office building with a 17-story tower and commercial storefronts at the ground level of the building, fronting Congress and Wabash Avenues. After 1889 the firm became known for their office buildings, particularly the 1891 Wainwright Building in St. Louis and the Schiller (later Garrick) Building and theater (1890) in Chicago. Other buildings often noted include the Chicago Stock Exchange Building (1894), the Guaranty Building (also known as the Prudential Building) of 1895–96 in Buffalo, New York, and the 1899–1904 Carson Pirie Scott Department Store by Sullivan on State Street in Chicago.