Alex Rose was sworn in as an at-large member of Allegheny County Council on Friday during an intimate ceremony attended by a handful of family and friends at the county courthouse.

The ceremony comes after Mr. Rose’s victory Nov. 4 in a special election against Councilman Mike Embrescia, a Republican. Mr. Embrscia had replaced former at-large Councilman Sam DeMarco, who stepped down to work for U.S. Sen. Dave McCormick, R-Pa., earlier this year.

“It is the end of a long, successful journey,” Mr. Rose said following the ceremony. “It feels very nice.”

Mr. Rose’s path to the seat was a contentious one, and his election victory also represented a historic era for County Council — which now does not have a Republican holding an at-large seat for the first time since the 15-person council wa

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