Lucas Lynggaard Tønnesen was born in Frederiksberg, district of Copenhagen, Denmark. He is a young actor, known for 1899 (2022), The Rain (2018) and Borgen (2010). His first appearance on TV was in the Danish Musical & Circus for children, Cirkus Summarum (2009), playing one of the leading roles "Buster", a kid trying to remind everyone, always to use their imagination. Tønnesen's first cinematic role was in Department Q: The Keeper of Lost Causes (2013) by director Mikkel Nørgaard