Greenberg is a self taught mixed media collage artist. A decade of collecting and selling vintage children’s books influences her choice of subject matter so that her work is often described as whimsical or fun. Her pieces are made from fragments of hand painted paper and ephemera. Greenberg took her first collage workshop in 2011 as a way to cope with the death of her sister and the onset of tinnitus. According to her, "It opened up a wondrous world of sparkle, spin and creativity that brings me great joy and takes me to a quieter place.” She has won numerous awards and is a member of several professional artist groups. Greenberg teaches collage to children and adults recovering from addiction or abuse.