When the Birth Centenary celebrations of Montessori was organised in New Delhi, he was in charge. A postage stamp was released on the occasion. V. Giri, President of India, presided over the function. Two years later, he left for US. Gupta stayed in touch with Joosten until his death in 1980, even visiting him during the latter's visit to Minnesota. Gupta took his elementary training with Margaret Stevenson in the USA in 1978. Later he completed his Master of Education degree from Century University, New Mexico, USA. He worked in AMI Montessori Houses of Children for about 20 years in India and the USA and in AMI elementary Montessori Schools for 25 years in the USA. Gupta was a Montessori trainer for both pre-primary and primary levels with the Southwest Montessori Training Center, Denton, Texas, USA for about ten years. He also gave orientation courses in Montessori Education at the College of St Scholastica, Duluth, Minnesota, and at the Chicago Community College, Illinois, USA. He was an Adjunct Professor with the University of Texas A & I, Kingsville, Texas, USA where he gave a pre-primary Montessori course to the Master of Education students. Gupta gave workshops in India as well as in the USA on various subjects during 45 years of his teaching career. He has written manuals for Montessori teachers in the areas of botany, zoology, and language, and published classroom materials on science, language, botany, zoology, and history. He has also published books written by Albert Joosten and other Montessorians. Currently he is the Director of the Indian Institute for Montessori Studies which is conducting Pre-primary cum Elementary course in Bangalore, India. Radha Nagaraj was a product of the infant Montessori school at Hymamshu. She took her pre-primary Montessori training from Joosten and Swamy in 1967–68 at the behest of the then Director, Sundaramma. She also set up a new Montessori at Mahila Mandali and worked there under the guidance of Swamy for ten years. Joosten came to Bangalore in 1978. Radha Nagaraj acted as his assistant for two years. She continued to work in Mahila Mandali since then as a Director. She took up assistance at IMTC from 1997 under Swamy, and continued to work there till 2002. She also handled the training in Kannada till 2004.