She specializes in algebra and arithmetic geometry, a newer field that applies techniques from algebraic geometry to solve problems in number theory and co-developed the method of field patching.

The role oversees finance and budget, facilities, staff human resources, and computing. Harrell had held the interim position since September.

Sieg focuses his research on public and urban economics, as well as the political economy of state and local governments.

His research provides a set of tools that are useful for empirical work with modern macroeconomic models, including forecasting and policy analysis.