Given that their close association challenged the conventional behavior of the day, perhaps it was only natural that the undergraduates took an even bolder step by founding their own Fraternity on December 10, 1899. Symbolized by the Greek letters Delta, Sigma, and Phi, the Fraternity was based on the principle of the universal brotherhood of man.

Uptown from City College at Columbia University, the second chapter was organized in 1901 but did not become a chapter until 1902. To differentiate the chapters, the first was called Insula, from the Latin insularis, since it was on the island of Manhattan. Because of its location in Morningside Heights, the new chapter was called Morningside.

Delta Sigma Phi was incorporated in New York City on December 2, 1902. Five members of Insula signed the incorporation papers, with the stated objectives of dissemination "the principles of friendship and brotherhood among college men, without respect to race or creed." The early organizers, including Meyer Boskey (Insula), also drafted Delta Sigma Phi's laws, requiring open membership to all college men of quality. The purpose of the Fraternity, written the same year, was "to fulfill the desire of serious young college men for a fellowship and brotherhood, as near a practical working ideal as possible not fettered with too many traditional prejudices and artificial standards of membership, and accompanied by a clean, pure, and honorable chapter home life."

Although such principles later would invite problems, the basic concept of the Fraternity-embracing brotherhood and congeniality without regard to religion race-not only attracted other idealists as City College of New York, it set the stage for expansion onto other campuses.

Here is a chronological look at Delta Sigma Phi.

1899

• Association formed at City College of New York, called Insula (the mother chapter, later renamed Alpha), on December 10

1901

• Second chapter established at Columbia University, called Morningside (Beta)

1902

• Delta Sigma Phi incorporated in New York state on December 15

1903

• Third chapter informally established at New York on December 15
• First national Fraternity dinner held December 26

1904

• Formal installation of University Chapter January 2

1905

• Constitutional Convention held in August at Insula' apartment
• Charles A. Tonsor, Jr. elected president, and Meyer Boskey elected secretary
• The Convention adopted a Constitution that created national offices and an executive committee to govern between Conventions
• Two new chapter formally received into the Fraternity during the Convention: Technology (Delta), which had been organized at the Massachusetts Institute of Technology in 1904; and Keystone (Epsilon), organized in 1905 at Penn State

1906

• Tonsor and Boskey chartered the Washington and Lee Chapter as Stonewall (Zeta)
• First alumni group chartered as the New York Alumni Chapter
• The Convention changed the Fraternity's approach to naming chapters to the present Greek-alphabet designations

1907

• Boskey, having conceived the idea of a national magazine to bind the chapters together, published the first issue of The Carnation in April
• Eta Chapter installed at Texas
• Theta Chapter installed at Cornell

1908

• Official badge designated at the convention
• Kappa Chapter established at Alabama Polytechnic Institute (Auburn) in November
• Iota Chapter installed at Penn in December

1909

• Lambda Chapter installed at Trinity
• Delta Sigma Phi became a founding member of the National Interfraternity Conference

1910

• Mu Chapter installed at Chicago
• Nu Chapter installed at Waynesburg

1912

• Omicron Chapter installed at Cumberland
• Convention created an Administrative Council with the power to grant chapters between Conventions

1914

• Office of national general secretary created at the Convention and Arthur Defenderfer chosen to fill the position
• The Ritual first published
• Fraternity restricted membership to men of the Christian faith
• Coat-of-arms, seal, pledge symbol, and badge adopted

1915

• First Delta Sigma Phi Headquarters opened in the Reibold Building, Dayton, Ohio
• Hilgard Chapter installed at UC-Berkeley
• Pi Chapter installed at Furman
• Rho Chapter installed at NC State
• Sigma Chapter installed at Thiel
• Tau Chapter installed in Hillsdale
• Upsilon Chapter installed at Franklin and Marshall
• The Carnation is named the official magazine of the Fraternity

1916

• Phi Chapter installed at St. Louis
• Chi Chapter installed at Tulane
• Psi Chapter installed at Wofford
• Omega Chapter (the last of the single Greek letter charters) installed at Pitt
• The Convention divided the nation into geographical districts, established a system of district deputies to supervise each one

1919

• Convention made biennial instead of annual
• First deputy district system established

1920

• Lon A. Scott, who had graduated from Cumberland University in 1915 as valedictorian of his class, became Delta Sigma Phi's first congressman

1921

• The Convention established Board of Governors of seven men with full power to manage and direct the affairs of the Fraternity; the Board of Governors later shrank to five members, and the Administrative Council disappeared, replaced by an Endowment Board of Trustees

1922

• On May 23 a trademark was granted to Delta Sigma Phi for the quarterly, The Carnation

1923

• The Sphinx, an esoteric publication, first appeared; it has been issued subsequently as needed
• The Convention adopted a ceremony for the dedication of new chapter houses and instituted the Pilgrim Degree, a special ritual for those making the pilgrimage to a national Convention
• The Fraternity initiated its first and only honorable member of the Fraternity when the Honorable James J. Davis, secretary of Labor in the Harding, Coolidge, and Hoover cabinets, was initiated at the request of Omega Chapter
• At the Fraternity's quarter-century mark, there were forty undergraduate chapters

1925

• First pledge manual issued; now called the Gordian Knot

1926

• Board of Governors adopted official Fraternity flag
• The first Sailors Ball held at Alpha Chi Chapter

1928

• First Fraternity Manual published

1929

• Fraternity reincorporated in the District of Columbia, where the offices of General Secretary Defenderfer were located

1931

• Harvey H. Herbert Award for distinguished service to the Fraternity first awarded

1932

• The Lute Songbook first published

1936

• First district training school for officers conducted in Chicago

1938

• Board of Governors banned Hell Week practices throughout the Fraternity

1940

• Upon the retirement of Arthur Defenderfer, the Headquarters moved from Washington, D.C., to Springfield, Ohio, the home city of Arthur Sprague, the new national treasurer
• Marcus E. Sharpe became executive director

1942

• Arthur H. Sprague became executive director

1946

• Harold Balback became executive director

1947

• System of universal life membership approved, providing The Carnation to each initiate as a life subscription
• Francis Wacker became executive director

1948

• Twelve chapters installed-the largest number in the history of the Fraternity-two revived

1949

• Deputy district system gave way to an eighteen-member governor system

1950

• Headquarters moved to Denver
• New flag chosen

1951

• The Delta Sigma Phi Foundation established; granted status as a nonprofit educational Foundation in 1958, it provides scholarships to students with high academic achievement and supports other Delta Sigma Phi educational programs

1954

• The Lute Songbook reissued

1959

• Delta Sigma Phi votes to end racial and religious discrimination policies (though the policies had not been enforced for much of the time they were in effect)