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Omicron Delta Kappa, or OΔK, also known as The Circle, or more commonly ODK, is a national leadership honor society. It was founded December 3, 1914, at Washington & Lee University in Lexington, Virginia, by 15 student and faculty leaders. Chapters, known as Circles, are located on over 300 college campuses. The society recognizes achievement in the five areas of scholarship; athletics; campus/ community service, social/religious activities, and campus government; journalism, speech and the mass media; and creative and performing arts. ODK is a quasi-secret society in regards to the way its members are selected and kept secret for a period of time. Membership in the Omicron Delta Kappa Society is regarded as one of the highest collegiate honors that can be awarded to an individual, along with Phi Kappa Phi and Phi Beta Kappa.
All fifteen men were prominent leaders on campus, and they rallied around the idea that all-around leadership in college should be recognized, that representative men in all phases of college life should cooperate in worthwhile endeavor, and that outstanding students and faculty should meet on a basis of mutual interest and understanding. The founders also insisted that ODK would not simply be another society in which members would simply earn a Key and then be finished. Members of ODK would be expected to remain active in campus politics, in upholding spiritual and moral values, and in rendering service to the campus and community.
The founders decided that the society would be kept a complete secret until keys could be designed and produced. A few days after returning from the winter holiday, the keys arrived, and on January 15, 1915, each man wore the key on campus for the first time, and the first public announcement of the establishment of Omicron Delta Kappa was made in the student newspaper on that same day. As stated in the announcement, the society would be publicly known as "The Circle," because the Greek letters have secret significance known only to the members.
Cheryl M. Hogle was elected as the first woman National President at the Convention in Knoxville, Tennessee on February 25. 1998. After serving four terms as a Faculty Province Director and two terms as National Vice President for Extension, she was elected by unanimous vote of the Convention.
On March 22, 1992, the National Convention passed a resolution authorizing the incorporation of the Society. On July 1, 1992, the Omicron Delta Kappa Society was merged into the corporation, The Omicron Delta Kappa Society, Inc.
Unlike most college honor societies that accept all potential members who meet the selection criteria and pay the required fees, ΟΔΚ only chooses a very select group from a pool of potential and qualified students through a process known as tapping. Once a Circle votes on the individuals to be tapped for membership, the selection is kept secret from all except for those who have been chosen for initiation. Once the chosen candidates are tapped, they must also keep their selection secret until such time when their selection is revealed to the campus and community in a public ceremony. Prior to this public revealing ceremony, the new members are initiated into the bonds of the society through the private ritual of the society. At some institutions where several elite societies are in place that tap new members, such as the University of Missouri, the public revealing ceremony is combined with those other highly selective or secret societies to become a large annual Tap Day ceremony on campus.
| # | Circle | Installation Date | College or University | Status |
|---|---|---|---|---|
| 1. | Alpha | December 3, 1914 | Washington and Lee University | active |
| 2. | Beta | May 1, 1916 | The Johns Hopkins University | active |
| 3. | Gamma | June 9, 1916 | University of Pittsburgh | active |
| 4. | Delta | May 24, 1917 | Davidson College | active |
| 5. | Epsilon | March 12, 1921 | University of Richmond | active |
| 6. | Zeta | May 27, 1921 | College of William and Mary | active |
| 7. | Eta | May 28, 1921 | Centre College | active |
| 8. | Theta | April 29, 1922 | University of Akron | active |
| 9. | Iota | February 21, 1924 | University of Alabama | active |
| 10. | Kappa | March 22, 1924 | Birmingham-Southern College | active |
| 11. | Lambda | April 12, 1924 | Hampden-Sydney College | active |
| 12. | Mu | January 24, 1925 | Emory University | active |
| 13. | Nu | May 4, 1925 | University of Kentucky | active |
| 14. | Xi | May 24, 1925 | Lehigh University | charter withdrawn |
| 15. | Omicron | May 28, 1925 | University of Virginia | active |
| 16. | Pi | March 8, 1926 | Millsaps College | active |
| 17. | Rho | May 26, 1926 | Duke University | charter withdrawn |
| 18. | Sigma | February 2, 1927 | University of Maryland | active |
| 19. | Tau | May 15, 1927 | Ohio Wesleyan University | active |
| 20. | Upsilon | May 17, 1927 | Dickinson College | active |
| 21. | Phi | May 25, 1927 | Rhodes College | active |
| 22. | Chi | May 29, 1927 | University of South Carolina | active |
| 23. | Psi | February 17, 1928; Rechartered April 5, 1997 | Allegheny College | active |
| 24. | Omega | May 22, 1928 | Auburn University | active |
| 25. | Alpha Alpha | May 19, 1929 | University of the South | active |
| 26. | Alpha Delta | May 25, 1929 | George Washington University | active |
| 27. | Alpha Epsilon | March 22, 1930 | Muhlenberg College | active |
| 28. | Alpha Eta | May 28, 1930 | Georgia Institute of Technology | active |
| 29. | Alpha Zeta | May 28, 1930 | Tulane University | active |
| 30. | Alpha Theta | March 7, 1931 | University of Cincinnati | active |
| 31. | Alpha Iota | March 23, 1931 | Rollins College | active |
| 32. | Alpha Kappa | February 24, 1933 | Washington University | active |
| 33. | Alpha Lambda | March 4, 1933 | Randolph-Macon College | active |
| 34. | Alpha Mu | May 10, 1933 | Denison University | active |
| 35. | Alpha Beta | May 12, 1933 | Drake University | active |
| 36. | Alpha Nu | May 12, 1933 | Louisiana State University | active |
| 37. | Alpha Xi | May 12, 1933 | University of Missouri | active |
| 38. | Alpha Omicron | June 2, 1933 | Virginia Polytechnic Institute and State University | active |
| 39. | Alpha Pi | March 5, 1934 | University of Denver | active |
| 40. | Alpha Rho | April 28, 1934 | Vanderbilt University | active |
| 41. | Alpha Sigma | May 31, 1934 | Miami University | charter withdrawn |
| 42. | Alpha Tau | April 9, 1935 | Westminster College | active |
| 43. | Alpha Upsilon | April 29, 1935 | University of Georgia | active |
| 44. | Alpha Phi | February 3, 1936 | University of Mississippi | active |
| 45. | Alpha Chi | May 22, 1937 | Mississippi State University | active |
| 46. | Alpha Psi | November 12, 1937 | Washington College | active |
| 47. | Alpha Omega | March 12, 1938 | American University | charter withdrawn |
| 48. | Beta Alpha | May 13, 1939 | Wake Forest University | active |
| 49. | Beta Beta | June 2, 1939 | University of Arkansas | charter withdrawn |
| 50. | Beta Gamma | February 15, 1942 | Albion College | active |
| 51. | Beta Delta | September 19, 1942 | Carnegie-Mellon University | charter withdrawn |
| 52. | Beta Epsilon | May 14, 1943 | University of Louisville | active |
| 53. | Beta Zeta | May 10, 1946 | Bucknell University | active |
| 54. | Beta Eta | June 9, 1946 | Wayne State University | charter withdrawn |
| 55. | Beta Theta | May 8, 1947 | Case Western Reserve | charter withdrawn |
| 56. | Beta Iota | May 10, 1947 | University of Iowa | active |
| 57. | Beta Kappa | May 11, 1947 | University of Kansas | active |
| 58. | Beta Lambda | May 23, 1947 | Marshall University | active |
| 59. | Beta Mu | June 3, 1947 | Grove City College | active |
| 60. | Beta Nu | November 16, 1947 | University of Tennessee | active |
| 61. | Beta Xi | May 23, 1948 | Beloit College | charter withdrawn |
| 62. | Beta Omicron | January 18, 1949 | Louisiana Tech University | active |
| 63. | Beta Pi | February 18, 1949 | Centenary College | active |
| 64. | Beta Rho | February 25, 1949 | Hillsdale College | active |
| 65. | Beta Sigma | March 9, 1949 | University of Delaware | active |
| 66. | Beta Tau | May 22, 1949 | Bowling Green State University | active |
| 67. | Beta Upsilon | June 2, 1949 | University of Miami | active |
| 68. | April 22, 1949 | Bradley University | active | |
| 69. | May 6, 1950 | New Jersey Institute of Technology | active | |
| 70. | May 13, 1950 | Drury University | active | |
| 71. | Seminole | May 13, 1950 | Florida State University | active |
| 72. | May 20, 1950 | University of Nebraska at Omaha | active | |
| 73. | November 16, 1950 | Marietta College | active | |
| 74. | April 6, 1951 | Samford University | active | |
| 75. | April 7, 1951 | Florida Southern College | active | |
| 76. | November 10, 1951 | Ohio University | active | |
| 77. | March 28, 1952 | Baldwin-Wallace College | active | |
| 78. | June 4, 1952 | Colorado State University | charter withdrawn | |
| 79. | May 14, 1953 | Stetson University | active | |
| 80. | April 4, 1954 | University of Redlands | active | |
| 81. | Sachem | May 8, 1954 | Oklahoma State University | active |
| 82. | Kalon-Kixioc | May 10, 1954 | St. Lawrence University | active |
| 83. | May 16, 1954 | University of Wyoming | active | |
| 84. | May 26, 1954 | The University of Southern Mississippi | active | |
| 85. | University Park | May 15, 1955 | Pennsylvania State University | active |
| 86. | May 21, 1955 | University of Oklahoma | active | |
| 87. | May 22, 1955 | University of Hawaii | charter withdrawn | |
| 88. | May 22, 1955 | Willamette University | charter withdrawn | |
| 89. | December 9, 1956 | University of Missouri-Kansas City | active | |
| 90. | March 24, 1957 | University of South Dakota | active | |
| 91. | May 17, 1958 | Western Michigan University | charter withdrawn | |
| 92. | December 12, 1959 | Washington State University | charter withdrawn | |
| 93. | March 1, 1960 | University of Louisiana at Monroe | active | |
| 94. | April 23, 1960 | Central Methodist University | active | |
| 95. | April 24, 1960 | University of Houston | active | |
| 96. | April 25, 1960 | Mississippi College | active | |
| 97. | May 21, 1960 | Westminster College | active | |
| 98. | May 21, 1960 | Whittier College | active | |
| 99. | May 28, 1960 | Wagner College | active | |
| 100. | April 29, 1961 | University of Tulsa | active | |
| 101. | May 21, 1961 | Purdue University | active | |
| 102. | April 14, 1962 | Hiram College | active | |
| 103. | May 12, 1962 | University of Illinois at Urbana-Champaign | charter withdrawn | |
| 104. | May 13, 1962 | Augustana College | active | |
| 105. | May 19, 1962 | Baylor University | active | |
| 106. | April 21, 1963 | Pittsburg State University | active | |
| 107. | May 17, 1963 | University of Memphis | active | |
| 108. | May 19, 1963 | Oklahoma Baptist University | active | |
| 109. | May 25, 1963 | McDaniel College | active | |
| 110. | May 26, 1963 | Michigan State University | charter withdrawn | |
| 111. | May 26, 1963 | West Virginia Wesleyan College | active | |
| 112. | April 19, 1964 | Erskine College | active | |
| 113. | October 22, 1965 | Kent State University | active | |
| 114. | May 7, 1966 | Illinois State University | charter withdrawn | |
| 115. | May 19, 1966 | University of Texas at Austin | charter withdrawn | |
| 116. | May 12, 1967 | Alma College | active | |
| 117. | April 5, 1968 | Georgia State University | active | |
| 118. | May 17, 1968 | University of Florida | active | |
| 119. | May 11, 1969 | University of Colorado at Boulder | charter withdrawn | |
| 120. | January 22, 1970 | Ohio Northern University | active | |
| 121. | February 15, 1970 | Murray State University | active | |
| 122. | May 20, 1970 | University of South Florida | active | |
| 123. | March 26, 1971 | University of New Orleans | active | |
| 124. | April 18, 1971 | Ferris State University | active | |
| 125. | April 24, 1971 | Valdosta State University | active | |
| 126. | April 24, 1971 | Western Kentucky University | active | |
| 127. | May 2, 1971 | Wichita State University | active | |
| 128. | May 23, 1971 | Delta State University | active | |
| 129. | December 10, 1971 | Louisiana College | active | |
| 130. | January 29, 1972 | Texas Tech University | active | |
| 131. | February 11, 1972 | North Carolina Wesleyan College | active | |
| 132. | April 22, 1972 | Houston Baptist University | active | |
| 133. | April 24, 1972 | Westmont College | active | |
| 134. | May 20, 1972 | University of Tampa | active | |
| 135. | May 21, 1972 | Northern Illinois University | charter withdrawn | |
| 136. | May 26, 1973 | Troy State University | active | |
| 137. | April 29, 1974 | University of Wisconsin-Eau Claire | active | |
| 138. | May 6, 1974 | Olivet College | active | |
| 139. | May 25, 1975 | University of Central Florida | active | |
| 140. | May 9, 1975 | William Carey College | active | |
| 141. | May 30, 1975 | Tennessee Technological University | active | |
| 142. | October 26, 1975 | The College of Charleston | charter withdrawn | |
| 143. | November 21, 1975 | Embry-Riddle Aeronautical University | active | |
| 144. | November 22, 1975 | University of Alabama at Birmingham | active | |
| 145. | December 15, 1975 | Salisbury University | active | |
| 146. | February 8, 1976 | Elmhurst College | active | |
| 147. | March 6, 1976 | Rider University | active | |
| 148. | March 6, 1976 | Wittenberg University | active |