Alex Greenwald

Alex Greenwald
Greenwald performing with Phantom Planet at Summerfest 2025
Born
Alexander Greenwald

(1979-10-09) October 9, 1979
OccupationsSinger, musician, songwriter, producer, actor
Years active1993–present
Partner(s)Brie Larson (2013–2019)
Phoebe Tonkin (2019–2020)
Musical career
Also known asClark Schädelkopf
Genres
Instruments
Years active1994–present
Labels
Member ofPhantom Planet
Formerly of

Alexander Greenwald (born October 9, 1979) is an American musician and actor. Prior to his music career, he began his professional career as a teen actor with both live-action and animated roles in films like The Halloween Tree (1993) and No Dessert, Dad, till You Mow the Lawn (1994), before primarily transitioning to a music career shortly after, and has been the frontman and rhythm guitarist of the California rock band Phantom Planet since their inception in 1994. Greenwald has also been a member of Blackblack (under the moniker Clark Schädelkopf) and the indie pop supergroup Phases and is a frequent collaborator of the British musician, DJ and producer Mark Ronson. Greenwald also played a minor role in then-fianceé Brie Larson's 2017 film Unicorn Store.