Gretje's photographs reflect a sensitivity for the arts, the natural world, and the human condition. Her wildlife and scenic photographs currently hang in multiple venues in Eastern Massachusetts. Her portraits of cancer survivors hang on the Massachusetts General Hospital Wall of Hope, and at the Gordon Cancer Center at Lahey Clinic. A personal project, Gay Dads and their Kids, has been shown at multiple galleries in the Boston area. She has photographed hundreds of Canadian and U.S. artists, authors, and business executives. Her work has been published in more than 50 international magazines, and has been shown in one-woman exhibitions across Canada and the Eastern United States. Until recently, she operated a portrait studio in Dedham, Massachusetts.