from training.npr.org: https://training.npr.org/sources/gurtina-besla/
Gurtina Besla is an assistant professor of astronomy at the University of Arizona. She is a theoretical astrophysicist who focuses on formation and evolution of low-mass dwarf galaxies, which are the most common class of galaxies in the universe.
Stephon Alexander is a musician and professor of physics and astronomy at Brown University. Born in Trinidad, Alexander is a theoretical physicist, jazz saxophonist and author specializing in the interface between cosmology, particle physics and quantum gravity.