Mellenbruch's practice involves a broad range of approaches to art, often taking place at the nexus of scientific research, transdisciplinary collaboration, and public participation. His Haven project (2011-ongoing) is a network of functional beehive sculptures that provide optimal habitat for honeybees, focuses public attention to their ecological plight and functions as a research tool investigating the causes of their recent demise. Haven is on view at the deCordova Sculpture Park in Lincoln, Massachusetts, the Kauffman Memorial Gardens, the Kauffman Foundation, Johnson County Community College, 18Broadway Urban Garden, and Hyde Park, as well as in numerous private collections.