Tricia Sumarijanto is HOA's music director since January 2009 and she is a leading ambassador for the music tradition. In July 2011 she helped organize a mass angklung performance on the National Mall, Washington DC. With more than 5,000 participants, it set a new world record in the Guinness Book of Records. The event which was held by the Embassy of Indonesia, was part of her ongoing mission to bring angklung onto the world stage and to use angklung to strengthen cultural understanding between the United States and Indonesia.
Her most recent initiatives, Angklung Goes to School (AGTS), promotes Indonesian and angklung to the younger generation of Americans by bringing this music to schools and universities. In 2014, AGTS assembled more than 200 students from schools in metropolitan Washington to perform outside on the Freer Gallery steps. Sumarijanto's commitment to music education and community led her to co-found Rumah Indonesia, which is dedicated to preserving the biculturalism and bilingualism of the Indonesian immigrant community.