Johanna Ewana Ekmark (born 8 October 1994), also known as Winona Oak and sometimes as Oaks, is a Swedish singer-songwriter. In 2018, she became known for her cover of the Haim song "Don't Save Me" and collaborative singles like "Beautiful" (with What So Not) and "Hope" (with The Chainsmokers).
Oak was born in UmeÃÂ¥ but grew up on Sollerön, an island in Lake Siljan in the central-southerly locality of Mora. She graduated from Moragymnasiet in 2013 and later moved to Stockholm.
In February 2018, Oak collaborated with What So Not for the single "Beautiful", which won Best Independent Dance/Electronica/Club single at the in July 2019.
In October 2018, Oak signed to Neon Gold and Atlantic.
Oak was featured on The Chainsmokers second studio album, Sick Boy (released December 2018), in the song "Hope". For the music video of the song, Oak appeared in "dressed in a tan trench coat and red flannel shirt".
On 10 December 2018 Oak released a music video for her cover of the song "Don't Save Meâ by Haim, via Neon Gold and Atlantic.
Oak released her debut studio album Island of the Sun on 10 June 2022.