Holz taught mathematics at the University of South Carolina, and was an engineer with
Melpar, a defense contractor. Beginning in 1954, she was an analyst for the United States Army's
Operations Research Office, later the Research Analysis Corporation, in
Washington, D.C. In 1961 she and Edward M. Girard represented the US at the American-British-Canadian Ad Hoc Working Group on
War Gaming and Simulation when it met in London. In the 1960s and 1970s, she helped to develop ELIM (the Enlisted Loss Inventory Model) and COMPLIP (Computation of Manpower Programs Using Linear Programming), early computer programs for modeling military manpower and logistics. Holz was a member of
Phi Beta Kappa, the
Society for Industrial and Applied Mathematics, the
Operations Research Society of America, and the
American Mathematical Society. == Selected publications ==