[2] Newcomer started her career as Visiting Assistant Professor at the University of Denver.

[4][5][6][7] Among her notable works are: Newcomer also serves on the Editorial Board of The American Review of Public Administration.

[11] Newcomer is a member of the National Academy of Public Administration since 1996, and currently serves on the Controller General's Education Advisory Panel.

[3] From 2006 to 2007, Newcomer served as President of the Network of Schools of Public Policy, Affairs and Administration (NASPAA).

She also served as a member of the board of the American Evaluation Association (AEA) from 2012 to 2015.