School Principals’ Day is widely attributed to Janet Dellaria, a teacher from Trout Creek, Michigan, who created the observance to recognize the dedication of school principals. No primary documentation from the founder has been identified.
The administrative era
From the 1920s through the 1960s, the principal's role solidified around operational management. Principals handled scheduling, discipline, budgets, building maintenance, and personnel decisions. They were evaluated on whether schools ran smoothly, not on whether students learned effectively. Superintendents delegated specific administrative authority to principals, moving them further from teaching.
During this same period, the demographics of the profession shifted notably. Between the early 1900s and 1950s, women held more than two-thirds of all elementary school principal positions. This proportion declined in subsequent decades before beginning to trend back: current estimates project the workforce at approximately 64% female as of 2026.



