Finneas O'Connell (born July 30, 1997), also known as Finneas (stylized in all caps), is an American producer, songwriter, and musician, most famously known for writing and producing music for his sister, Billie Eilish.

Before his breakout as a musician, he was an actor with minor recurring roles in the popular TV shows Modern Family and Glee. He also starred in the 2011 film Bad Teacher and worked with his mother on the indie film Life Inside Out, and also recorded portions of the official soundtrack.

From 2012-2016, Finneas acted as the frontman of the LA-based, pop-rock group The Slightlys, which split before the release of his August 2016 track, “New Girl”.

In March of 2019, Finneas collaborated with his sister, Billie Eilish, to release her record-breaking debut album, WHEN WE ALL FALL ASLEEP, WHERE DO WE GO? The album broke Apple Music’s record for the most pre-saved album and, once released, Billie’s album debuted at No. 1 on the Billboard 200 chart.

On October 4, 2019, Finneas released his debut EP, Blood Harmony, a title describing “what it sounds like when siblings sing together, that biologic chemistry.” The EP included Finneas’ massively popular track, “Let’s Fall in Love for the Night,” which peaked at #17 on the US Billboard Alternative Songs chart.

At the 2020 Grammy Awards, Finneas won five awards, including producer of the year, song of the year, and album of the year. In a later interview with Vogue, Finneas described how the wins felt:

We were both kind of embarrassed to win so much; you hope that it will be kind of equal, but after the third in a row…well, we love all of our fellow nominees.

Besides writing and producing his and Billie’s music, Finneas has also cowritten and produced songs with other artists like Selena Gomez, Justin Bieber, Camila Cabello, JP Saxe, and Halsey.

On October 15, 2021, the producer released his first solo debut album, Optimist.

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