Erwin Schroedinger (1887-1961) is best known as a co-recipient of the 1933 Nobel Prize in Physics for his development of a mathematical description of quantum mechanics. Today, many experts also consider him the father of bioengineering, and philosophers grant him an important role in the development of an ecological philosophy of nature. Here, four leading scientists and humanists reveal the ongoing contributions of Schroedinger's thought and unfold its controversial potential. They remind us that, in addition to being a great scientist, Schroedinger was also a great thinker whose intellectual provocations far exceed his historical impact. Their insights will be valued by biologists, philosophers, physicists-and a wide range of the scientifically curious alike.