Keiren was born in Sydney and studied piano at the Sydney Conservatorium. While he was an undergraduate, he appeared as the musical director of the Sydney University Dramatic Society’s production of The Threepenny Opera. After graduating in 2013, he enrolled in the Masters Conducting course at the Conservatorium. During this time he was Musical Director and Composer for the Sydney University Arts Revue and composed music for the Sydney University Dramatic Society’s production of Much Ado About Nothing as well as being assistant to performances by the Conservatorium Choir and Orchestra (Mozart’s Requiem, 2014), The Early Music Ensemble (2015) and the Opera Unit (Malcolm Williamson’s English Eccentrics 2015).

In 2015 he graduated from the Sydney Conservatorium’s Masters programme, conducting Stravinsky’s Pulcinella Suite and Paul Stanhope’s Jetstream for his graduation concert. Since his graduation Keiren has been appointed conductor of the Men's Shed Chorale and has been engaged by several community orchestras.

In 2016 he conducted the Australian Premiere of Jonathan Dove’s Opera, Mansfield Park with Operantics and in September will conduct La Sonnambula. He works regularly with community orchestras and choirs, especially with the Loftus Probus Choir and maintains a busy teaching studio.