Keen’s artwork has been shown in regional, national and international exhibitions. He has received grants from the Maine Arts Commission, University of Rhode Island Visual Art Sea Grant, and Berkshire Taconic Community Foundation. His work was in the United States "Art in Embassies Program" and he has been a visiting artist at various educational institutions. Curators and critics who have selected his work include: Tracey Bashkoff, Associate Curator of Collections and Exhibitions at the Guggenheim
Museum selected his work for the “Encaustic Works 2003 Biennial” at Marist College in Poughkeepsie, NY. Lisa Dennison, Director and Chief Curator at the Guggenheim Museum chose his work for the 2002 Cambridge Art Association's “National Prize Show” in Cambridge, MA. Other prominent jurors who have selected his artwork include: Phyllis Braff, Critic for the New York Times, Anne Rocheleau, Director of the Rhode Island Foundation Gallery, Moira Kelly, prior Director of Air Gallery in London, and Bruce Brown, Curator Emeritus of the Center for Maine Contemporary Art. Represented by Elizabeth Moss Gallery, Cynthia Winings Gallery and Simon Gallery.