Kepler's four-year transit survey transformed our understanding of exoplanet demographics. Using the repurposed Kepler spacecraft, the ongoing K2 mission provides a natural transition from Kepler to the imminent all-sky TESS survey. For the past three years I have led a large, multi-institutional team using UCO facilities to discover, follow up, validate, and characterize hundreds of new candidates and planets using data from K2 and to prepare for TESS. I will highlight some of our key results from the first two years of K2 data, including new multi-planet systems, a dramatic expansion of the mass-radius diagram for small exoplanets, and high-priority new targets for atmospheric characterization with HST and JWST. I will conclude by summarizing what these efforts suggest in the context of TESS follow-up with the APF and Keck, and the path forward to future exoplanet discovery and characterization in the era of JWST, TMT, and beyond.