Political newcomer and community activist Theresa M. Pierno stunned four-term County Council member John W. Schafer, D-District C, defeating the incumbent in his bid for a fifth term Tuesday.
Since no Republican ran in the primary, Pierno will be unchallenged in the Nov. 6 general election.
Pierno took 36.5 percent of the vote in the Democratic primary race, followed by Schafer with 27 percent of the vote John L. Cox, a University of Maryland consultant to local governments, garnered 21.4 percent.
Pierno received 7,268 votes, compared to 5,380 votes for Schafer and 4,256 for Cox.
No Republican ran for the post.
Pierno is president of the Community Coalition of Harford County, an organization of 29 community associations that had sounded the alarm bell against continued fast-paced growth early in the election.