Born in Auckland, New Zealand in 1971, Tecwyn studied composition and conducting at the University of Otago under Jack Speirs, obtaining a 1st class Honours degree and a Masters degree with distinction, both in composition. In 1994, he won the Philip Neill Memorial Prize (with his organ work, Gerausvoll) and several university awards including a postgraduate scholarship to undertake a Masters degree in composition.
Appointed Composer-in-Residence with the Dunedin Sinfonia in 1995 at the age of 23, he composed two works during his tenure ? Sinfonietta for chamber orchestra (premiered in June 1995), and Symphony ? Organ (premiered in July 1997). Two works, Score One and Sinfonietta, were performed at the Auckland Philharmonia Orchestra's composition workshops in 1994 and 1996. He was also commissioned to write a fanfare to celebrate the Dunedin Sinfonia's 30th season - a work entitled Fires of Light.
His composition output aside from these orchestral works includes a string quartet, several works for organ, solo instrumental works (for clarinet and flute), solo vocal pieces and a number of a cappella choral works including Onward which has been performed by the NZ Secondary Students' Choir. His compositions have been performed in New Zealand, the United States, United Kingdom, Australia, Republic and Hungary. As a conductor he made his professional conducting debut with the Dunedin Sinfonia in July 1997, and later that year he took up study on a Fulbright Postgraduate Scholarship at the University of Kansas where he studied conducting with Simon Carrington and Brian Priestman.
From 1999-2002 he was Chorus Master at Glyndebourne Festival Opera in the United Kingdom, and now freelances as a conductor and composer.