Lasse Antonsen was born in Copenhagen in 1947, and studied art in Denmark in 1963-64 at the Experimenting Art School in Copenhagen with Poul Gernes, Per Kirkeby and the art historian Troels Andersen. He studied art and creative writing in 1964-65 at Kunsthøjskolen in Holbæk with the poets Poul Borum and Inger Christensen.
In the late 1970s he studied art history at Copenhagen University, and then continued his studies in the US at Harvard University Extension and Tufts University. He received an MA in art history from Tufts University in 1986, with a thesis on iconography and influence in Picasso’s work in the 1930s.
In the mid-1980s, Antonsen was a researcher at the ICA in Boston, and from 1985-87 he was curator at the Danforth Museum in Framingham, Massachusetts, where he presented the work of artists such as Alberto Giacometti, Henri Michaux and Paula Modersohn-Becker.
From 1987 to 2012, he was Director of the University Art Gallery at University of Massachusetts Dartmouth, where he, among others, featured the work of Ilya Kabakov, Ana Mendieta, Frank Stella, Pedro Cabrita Reis and Nancy Spero.
Throughout his career, Antonsen has taught classes in Modern and Contemporary Art, and conducted graduate seminars at institutions such as the Rhode Island School of Design and Massachusetts College of Art.
Lasse Antonsen has been an exhibiting artist since 2005. His work and installations have been featured, among other places, at the Providence Museum of Natural History in Rhode Island; the Mestrovic Pavilion in Zagreb, Croatia; Bristol Art Museum, Bristol, Rhode Island; and Kunst Kraft Werk in Leipzig, Germany. From a focus on objects and narrative structures, Antonsen has lately been focusing on the creation of cloth collages, referencing 1950s abstraction and the Korean Bojagi tradition.