The top assistant to new Medford Mayor Stephanie Muccini Burke resigned last week after just six weeks on the job.

Burke confirmed Teresa Walsh, her chief of staff and the city’s personnel director, resigned Feb. 12.

Burke declined to comment on the reason for Walsh’s resignation. As of Thursday afternoon, Burke had not filled the vacancy left by Walsh.

“I am talking to different people,” Burke said.

Burke’s office sent an email to city employees at 2 p.m. today announcing Walsh’s resignation.

The email, sent by mayor Executive Assistant Lauren Feltch, read: “Please be advised that Teresa Walsh has resigned from the Mayor’s Office effective Friday, February 12th. If you have any questions please feel free to contact our office.”

Walsh served as campaign advisor for Burke leading up to last November’s municipal election. Before her appointment as Burke’s chief of staff, Walsh taught law courses at Tufts University and the University of Massachusetts School of law.

Walsh’s background also includes stints as assistant attorney general and public defender in Massachusetts and as associate attorney at Boston-based global law firm Bingham, Dana & Gould.

According to her profile on Tufts’ Department of Political Science website, Walsh is the founder of Meritus, LLC, a Medford-based progressive public policy firm “where she pursues her long term interests in Democratic state and national politics.”

Walsh’s annual salary in Medford was $106,420.