Concepcion is the Headmistress of Marymount School, New York. Concepcion began her career as an educator at international schools in Asia and the Middle East. In 1988, she went to New York to pursue her Masters degree in Special Education at Teachers College, Columbia University. Concepcion served as a classroom teacher at Marymount School before she became the Director of Admissions in 1991. She was appointed to be the School's first lay Headmistress in 2004.