This talk presents an overview of my research on dark energy. Hypothesized as a new form of energy to explain the observed accelerated expansion of the universe, dark energy is one of the most formidable scientific problems of our time. Its discovery, in 1998, was awarded the physics 2011 Nobel prize, yet, its explanation remains elusive. My most well-known work is the DESGW project, which inaugurated the sub-field of multi-messenger cosmology with standard sirens. Rapid growth prospects in this area are fueled by the increased sensitivity of gravitational wave detectors and the discovery capability of cosmic survey instruments. I also pursue precision cosmological measurements using galaxy clusters. These two research thrusts complement each other, as clusters allow us to distinguish between dark energy models that predict the same expansion rate for the universe. Results of this research program will include precision cosmological measurements to enable a breakthrough in our understanding of dark energy.