Stoeger is a staff scientist for VORG specializing in theoretical cosmology, high-energy astrophysics, and interdisciplinary studies relating to science, philosophy and theology.

He was born October 5, 1943 in Torrance, California and spent the first 18 years of his life in Redondo Beach, California. He entered the Society of Jesus in September 1961, and in 1967 completed his bachelor's degree with honors in philosophy, with a strong secondary concentration in physics and mathematics, from Spring Hill College, Mobile, Alabama. In 1969 he was awarded an M.S. in physics from UCLA. After lecturing briefly in the physics department at the University of San Francisco, he began theological studies at the Jesuit School of Theology in Berkeley, California, where he finished an S.T M. and was ordained to the priesthood in 1972. Afterwards he pursued doctoral studies in astrophysics at Cambridge University, England, and completed his Ph.D in 1979. From 1976 - 1979 he was a research associate with the theoretical gravitational physics group at the University of Maryland, College Park, Maryland. And in September 1979 he joined the staff of the Vatican Observatory.

Stoeger's research has dealt with various problems connected with the physics of accretion onto black holes, and mathematical and physical issues connected with torsion and bi-metric theories of gravity, as well as the harmonic map structures contained in gravitational theories, including general relativity. More recently, with collaborators from South Africa, England, and the United States, he has been concentrating on observationally oriented projects in theoretical cosmology, attempting to build more adequate bridges between theory and cosmologically relevant astronomical observations and observations of the microwave background radiation. He also continues to pursue some research on the physics of the central engine in active galactic nuclei and quasars.