Scott Dodelson is Head of the Department of Physics at Carnegie Mellon University. He received his Ph.D. from Columbia University and was a research fellow at Harvard before moving to Fermilab, the University of Chicago, and Carnegie Mellon. He is the author of more than 200 papers on cosmology, most of which focus on the cosmic microwave background and the large-scale structure of the universe. Dodelson serves as the co-Chair of the Science Committee of the Dark Energy Survey.Fabian Schmidt is a research group leader at the Max-Planck-Institut für Astrophysik (MPA) in Garching, Germany. He obtained his Ph.D. in Astronomy & Astrophysics at the University of Chicago in 2009, and moved to MPA after fellowships at Caltech and Princeton. His work in cosmology (approximately 100 papers so far) focuses on theory, numerics, and analysis of quasilinear and nonlinear large-scale structure, and how we can learn from it about gravity, dark energy, and the physics of inflation.