The son of Swedish immigrants, Nathaniel Pousette-Dart became a painter of Minnesota landscape and other subjects in styles ranging from realist to non-objective.  He studied at the Art Students League of New York, and with Robert Henri at the Pennsylvania Academy of Fine Arts in Philadelphia. 

After this period in the East, he returned to St. Paul, Minnesota and established his reputation.  Rena Coen in her book, Minnesota Impressionists, wrote: "After returning  to St. Paul, his work won prizes at many Midwest exhibitions.  In addition to painting, he worked for the Bureau of Engraving and in advertising.  Pousette-Dart was also an instructor at the St. Paul Art Institute and served as Director of the Art Department at the College of St. Catherine.  He relocated the an artist's colony in Valhalla, New York, where lived until his death on October 17, 1965."

In 1913, he was married to Flora Louise Dart, who was progressive about marriage, and believed that marriage should be a mutual sharing relationship and not one where the wife vows to love, honor, cherish, and 'obey.'   She, in agreement with the groom, revised the traditional marriage vows to reflect their attitudes, and after the marriage, they combined their last names to Pousette-Dart.

Sources:

Rena Coen, Minnesota Impressionists

Wikipedia: Nathaniel Pousette-Dart