NEW HAVEN — A Yale School of Management (SOM) professor has filed a lawsuit against Yale University and three SOM faculty members alleging gender and age discrimination.

Constance E. Bagley, a professor in the practice of law and management at SOM, alleges in the suit that she was not reappointed to her professorship in May 2012 because of her gender and age. Bagley also asserts that while co-teaching the course “State and Society” with SOM Professor Douglas W. Rae, she was subjected to repeated acts of discrimination on the part of her male peer.

The suit filed by Bagley against Yale University, SOM Dean Edward Snyder, SOM Deputy Dean Andrew Metrick and Rae lists 18 counts of discrimination. The action seeks monetary damages for Bagley and asks the court to enjoin Yale to cease gender and age discrimination.

“A culture exists within Yale in which strong, assertive and professionally accomplished women who are not stereotypically female in their appearance, behavior and attitudes are viewed negatively because they do not meet certain gender expectations by the dominant male leadership,” the suit alleges.

The suit comes following more than a year and a half of efforts by Bagley to overturn the decision not to renew her professorship, during which three separate committees were convened to examine the process through which she was not reappointed.

“I did this as a last resort,” Bagley told the Yale Daily News.

Snyder, Metrick and Rae have all declined to comment on the lawsuit.