only 11 active chapters. Post War era: 1945-1980 Following World War II, many veterans attended college under the GI Bill. Sigma Pi, again, took advantage of the spur in college enrollments. By 1950, Sigma Pi had grown up to 53 chapters, 7 of which remained inactive. In 1960, the Fraternity had grown another 10 chapters, leaving Sigma PI with 63 chapters. In 1945, Byron R. Lewis made a contribution to the fraternity to start an educational fund to provide scholarships to worthy brothers. This gift was the start of the Byron R. Lewis Educational Foundation which was incorporated in 1952. The chartering of Beta-Kappa chapter at Arizona State University in 1951 was a special one for Sigma Pi. Beta-Kappa is the only chapter (other than Alpha) to have a founder, James Thompson Kingsbury, assist with its founding. Kingsbury assisted with the start of the Sigma Pi colony but died before the chapter received its charter. During the 1960s the fraternity added 39 chapters, giving it 109 total chapters. In 1961, Vincennes University (through the work of Curtis Shake and Isaac K. Beckes) donated the Shadowwood estate to the fraternity for use as its national headquarters. After renovations in 1962 to Shadowwood's plumbing, heating, and electricity the fraternity moved its national office into the home on July 1, 1963. 1964 saw the merging of a national fraternity into Sigma Pi. A 1953 edict by the New York State Board of Regents prohibited any national fraternity from existing at any state-funded university. Therefore, this forced many chapters of Delta Kappa fraternity to close or become local fraternities. The fraternity had been founded in New York state and half of its chapters were impacted by this. Delta Kappa's national structure was weakened after the edict, but chapters in the rest of the country were determined to continue their national tradition. After ten years of trying to recover, Delta Kappa's national leadership began looking for another fraternity for its chapters to join. They petitioned Sigma Pi for membership for their six remaining chapters. This was approved in 1964, and consequently, four Delta Kappa chapters were re-initiated as members of Sigma Pi. William J. Cutbirth became the first Sigma Pi to be president of the North American Interfraternity Conference when he was elected to a term running from 1974 to 1976. International era, 1980-Present The 1980s saw growth in the fraternity as it chartered 42