Mr. and Mrs. Anthony Traill opened the first Traill School over forty years ago, in 1966 at Soi 11, Paholyothin Road with 80 students. They named it the Preparatory school. Most of its students were prepared for entry in schools and universities in the US and Britain. The school quickly expanded to 300 students, catering mainly to American expatriates who preferred the academic style of British education. The Preparatory School grew to 3 campuses, Sukhumvit Soi 3, Paholyothin Soi 11 and Ramkhamhaeng Soi 18 (where the School is currently based).

Mr. Traill very much believed in the all-round development of his students, including athletic, academic and moral attributes. He combined the achievement of academic excellence with the development of good character, setting the students in a warm and homely environment that was to become the defining trait of the Traill School today.

Mr. Traill was very innovative; the school was the first international school in Thailand to be fully air-conditioned, pioneering GCE O’levels, and introducting computers before they became mainstream in the education system. The School became recognised as one of the computer examination centres for London University in Thailand. When O’levels were replaced by Cambridge University IGCSE’s, he made sure that the School was the first to become a centre and adopt the more up-to-date system.

With over 40 years of academic excellence, the Traill family is still fully involved in the School as Directors. Over the next few years there will be an expansion in the size of its buildings and in the range and quality of its facilities. This is in keeping with the ideals established by Mr Traill of moving the school forward while maintaining a friendly and secure environment for students to flourish and develop into well-rounded individuals, academically, morally and physically.