When Harford Day School opened its doors to 30 children in kindergarten through second grade in September of 1957, it marked the realization of a dream of a small group of families who wanted to provide an educational choice for Harford County families with young children. The group was led by Sara Brumfield, who became the founding headmistress, Mignon Cameron, who taught French and history for twenty years, and Sidney Poor, who spent countless hours volunteering and sent two of her sons to Harford Day.
The school added a grade each year, as well as students to existing grades, and it quickly outgrew its original space. A capital campaign fell short of its goal, but Harford Day borrowed money, bought 8 acres on Moores Mill Road in Bel Air, and built a new building with six classrooms and a multipurpose room in 1961.
By the time Sara Brumfield retired in 1975, the school had 197 students. Mignon Cameron retired a year later, but she and Sara Brumfield left behind a legacy that continues to this day. They believed that a strong foundation in the basics of English, math, history, and science, combined with exposure and appreciation for the arts would help children develop into lifelong learners.
Su Harris, who had been admissions director and a math teacher, was hired in 1993. Her skilled leadership and respect for the legacy of Sara Brumfield and Mignon Cameron ushered in a new future. A new kindergarten was completed in 1995 and a new middle school building opened in 2000 and a Science Wing with a multipurpose room was added in 2008. Athletic opportunities were expanded and performing arts facilities and programs improved.
In 2014, Gray Smith, Ed.D. became Harford Day School's seventh Head of School. An alumnus of St. Paul's School, Dr. Smith came to Harford Day from Severn School where he was the Middle School Head. Prior to Severn, he served as a teacher, coach, and administrator at Boys' Latin School, Pine Crest School (FL), and Louisville Collegiate School (KY).