Described by the Herald Sun as "reinforcing opera with an edge", and by the Age as "too loud", Kate (she/her) is an award-winning opera director, with a focus on creating socially responsible opera. In 2016, she founded BK Opera and has gone on to produce and direct a vast array of operas, ranging from Puccini to Poulenc, Mozart to Massenet, as well as multiple marathon opera performances for White Nights across Victoria. She has also completed secondments with WA Opera, Pinchgut Opera (dir. Mitchell Butel), and Adelaide Festival (dir. Neil Armfield). Millett has become known for her dark and intimate work, with her production of ‘Abduction from the Seraglio’ later invited to be a part of London’s Opera in the City Festival.

Outside of opera, she has an abiding interest in aerospace, spending 2019 as head of Mission Control for RMIT’s award-winning HIVE Rocketry team.