City Council Elects New Leaders

The Mercer Island City Council elected new leadership during the Council’s regular meeting on Jan 6, 2026.

Councilmember David Rosenbaum was elected mayor, elevating him from deputy mayor, a position he had held since 2022. First elected to the Council in 2019, Rosenbaum is a third-generation Washingtonian who moved to Mercer Island with his family after many years working as a congressional aide in Washington, D.C.

Daniel Becker was elected as the new deputy mayor. He was previously appointed by the Council in June of 2025 to serve in Position No. 7 after the passing of former Councilmember Jake Jacobson. Becker was subsequently elected to fill Position No. 2 on the Council in the November 2025 general election.

Rosenbaum and Becker will serve two-year terms in their positions.

After prevailing in the election in November, several Councilmembers were administered the oaths of office during the meeting to officially begin their four-year terms, including Becker, as well as Councilmembers Ted Weinberg (Position No. 4) and Lisa Anderl (Position No. 6). Councilmember Julie Hsieh was elected to fill Position No. 7 and was sworn in last month.