The school officially opened on the 17th May, 1964 under the guidance of the Director, Sr. St. Albert. The school initially took girls from Kindergarten through to primary level, with 19 teachers and 406 students. In latter years, the school expanded up to lower high-school and within the last few years has expanded further to accept girls right up until the end of high school (grade 12). There are 85 Thai teachers and 18 foreign teachers. Kindergarten has now also started to accept boys.
The school is currently under the directorship of Sr. Rosa Regina Chompaisal, who is now in her fifth year at SJR.
The primary objective of SJR is to provide a high quality of education for girls, focusing on the development of their mind, an understanding of health, respect for society and emotional awareness. SJR follows the goals of Saint Paul of Chartres which include providing students with education that promotes knowledge, understanding, high morals, politeness and discipline.
All the students have been learning on an intensive English language program with native English speakers for the last five years now. Chinese language has also been taught by native Chinese speakers for several years now too.