From there, she was recruited to Vanderbilt University to study bacteriophage T4, a topic for which she became a leading investigator.[1] After postdoctoral research at Vanderbilt and then the Carnegie Institute of Washington at Cold Spring Harbor (with Nobel laureate A. D. Hershey), she returned to Vanderbilt as a faculty member in 1965, and became a citizen of the United States of America in 1968. Mosig served on the Vanderbilt faculty until her death in 2003.[1]