Stephon Alexander is a theoretical physicist specializing in the interface between cosmology, particle physics and quantum gravity (String Theory and Loop Quantum Gravity). He is currently the Ernest Everett Just 1907 Professor of Natural Sciences. He received his BSc (1993) from Haverford College and PhD (2000) from Brown University. He held postdoctoral fellowships at Imperial College, London and The Stanford Linear Accelerator Center. He previously held faculty positions at Penn State and Haverford College.