Schrödinger published a very interesting treatise (What is Life - http://www.whatislife.ie/downloads/What-is-Life.pdf) which inspired a generation of physicists to study biology. Biology is still mostly at the early observational phase (similar to physics in the early Renaissance period), although slowly more systems-level approaches are being applied to be able to model biology with the same types of tools (namely mathematics) that have been so successful in physics.