Ask la Cour was born in Copenhagen, Denmark, and began his dance training at the age of nine at the Royal Danish Ballet School, where he studied with Niels Balle, Adam Lüders, and Colleen Neary. He joined the Royal Danish Ballet as a member of the corps de ballet in 2000. Mr. la Cour joined New York City Ballet as a member of the corps de ballet in the fall of 2002, was promoted to the rank of soloist in May 2005, and became a principal in February 2013.