Gregory Costa Cuautle: microlensing (a super useful, if terribly unsatisfying, technique for exoplanet detections). Measuring the center of light, not just the brightness, helps break degeneracies in planet size/distance from star and source vs. lens.
What about exomoons? Nancy Grace Roman Telescope should be able to find certain star-planet-moon configurations, but more simulations needed.
He's an undergrad! That was a great talk!