William Kircher first came to prominence in New Zealand television in the police drama series Shark in the Park.

[1] Kircher lied about his age when applying to Toi Whakaari, the New Zealand Drama School, so he was only 18 when he graduated two years later.

[4] In the late 1990s, Kircher shifted his focus away from acting toward production, singing, and executive management.

[3] He returned to acting in 2006 in the film Out of the Blue which was based on the true story of the Aramoana massacre.

[1][5] In 2018 he directed Steven Dietz's play Trust in North Hollywood with Zachary Cowan, Caroline Henry, Elizabeth Izzo, Paul McGee, Caroline Simone O’Brien and Heidi Rhodes.