Prof. Steigman joined the faculty in 1986 with a joint appointment in Physics and Astronomy. He is a cosmologist specializing in the physics of the early universe and the particle physics-astrophysics connections. His work on the matter-antimatter asymmetry of the universe led the way to the development of a strong interplay between early universe cosmology and theories of elementary particle physics. Prof. Steigman is perhaps best known for his classic works on primordial nucleosynthesis, a crucial test of big bang cosmology and the standard model of particle physics. His current research continues to explore the joint constraints implied by big bang nucleosynthesis and the cosmic microwave background on the particle content of the universe, dark matter, and dark energy. He was named a Distinguished Professor of Mathematical and Physical Sciences, and is now Professor Emeritus in the Physics and Astronomy Departments.