Tessa Rose Jackson (born 22 August 1992) is a multi-disciplinary artist, singer and songwriter based in Amsterdam, Netherlands, and London, United Kingdom. She started releasing singles in 2012, released a full-length album, entitled (Songs From) The Sandbox (2013) and another single ('The Pretender') in 2015.
From 2017 onwards she adopted the moniker Someone for her indie pop / psych-pop songwriting, using her real name for collaborations and guest features on records by others, including Christian Reindl and Feiertag. In 2023 and 2024 she started releasing singles as Tessa Rose Jackson again, apparently abandoning the Someone moniker.