[1] The Society of Kappa Psi was founded on May 30, 1879, at the Russell Military Academy, a prep school in New Haven, Connecticut.

Within a short time, the revised ritual and constitution, along with the necessary forms, records, and updated charters were issued to the chapters.

Also, many of the strong leaders of Kappa Psi were associated with pharmacy schools and had remained with the original fraternity.

When World War II ended in 1945, Theta Kappa Psi comprised only twelve collegiate chapters.

Several frustrated national officers began negotiations with representatives of Phi Beta Pi Medical Fraternity for a merger.

The last national convention of Theta Kappa Psi convened on March 11, 1961, at the McAllister Hotel in Miami, Florida.

Theta Kappa Psi Fraternity, as a distinct national entity, passed into history.

Theta Kappa Psi was officially invited to merge with Phi Beta Pi upon the condition that Theta Kappa Psi would surrender its name, rolls, and treasury to the national Phi Beta Pi office in Pittsburgh, Pennsylvania.

Legal action threatened by Phi Beta Pi concerning the use of the name, caused no meetings [in support of the possible schism] to be held after 1962.

Beta Epsilon chapter at Ohio State University continued as an independent local fraternity until 1964 when poor finances caused it to fold.

Psi chapter at the University of Texas Southwestern Medical Center pledged members until 1968 as a local independent fraternity.

Gamma Tau chapter at the University of Manitoba continued as an independent local fraternity until it became inactive in 1968.

At that time, the chapter lost all formal structure when it allowed non-members to live in its fraternity house.

Gamma Kappa chapter at the Medical College of Georgia affiliated with Phi Beta Pi after the merger.

Although listed as a chapter of Phi Beta Pi, the group considered itself a member of Theta Kappa Psi.

In the spring of 1992, the merger of Phi Beta Pi and Theta Kappa Psi was dissolved.

Theta Kappa Psi adopted a new coat of arms, insignia, badge, and pledge button.