1. Sang-Kil Son, “Resonances in x-ray multiphoton ionization” in Molecular quantum dynamics beyond bound states (Institute of Physics, Rostock University, Rostock, Germany, March 10-12, 2021) [invited talk].
2. Sang-Kil Son, “A two-step model for studying ionization potential depression in dense plasmas” in Average Atom Models for Warm Dense Matter (University of California, Berkeley, Berkeley, California, United States, June 28-29, 2021) [invited talk].
3. Sang-Kil Son, “What happens to atoms, molecules, and dense plasmas at high x-ray intensity?” in Seminar (Laboratory for Laser Energetics, University of Rochester, Rochester, New York, United States, September 14, 2021) [invited talk].