Dermot McGrath is Irish from Cork. He is a language instructor and methodologist. He began his professional career at Berlitz/Inlingua in Madrid in the nineteen-seventies, where he became Director of Studies. He moved to Catalonia at the end of that decade and founded a language school in Tarragona, La Casa Irlandesa, which prompted him to begin writing his own methodology. Later, he founded the academy Celtic House.
More than 100,000 students have used his pedagogical system to do the official University of Cambridge EFL exams.
His interactive method, Linguapuncture, is used in many public and private educational centres in Spain. In 2013 he signed a collaborative agreement with the University of Cambridge with the objective of preparing students online for official English exams, particularly the First Certificate.