He teaches course in a wide variety of painting media and topics and also teaches the Studio Professional Practice course for Seniors. He offers one graduate course in Painting As Practice. Linehan is represented by Littlefield Gallery in Winter Harbor, Maine. He has exhibited widely in Maine and New England, as well as New York and Japan in twenty solo exhibitions including three in NYC at Sherry French Gallery, and 150 group exhibitions over the past 25 years. He has completed 20 public and corporate art projects, including 15 Percent For Art murals for the Maine Arts Commission. His work is included in over 30 public and corporate collections including the Portland Museum of Art, the Farnsworth Museum, Bates College, L.L. Bean, Bank of America, and UNUM, as well as over 75 private collections.