Joseph Michael Sempolinski (born February 10, 1983)[1][2] is an American politician who is a member of the New York State Assembly from the 148th district.

[4] Between 2010 and 2015, Sempolinski worked in the office of Congressman Tom Reed, including as District Director.

Though two Republican candidates emerged for the newly redrawn district, former Buffalo School Board member Carl Paladino and eventual primary winner Nick Langworthy, both lived outside the bounds of the 23rd district as drawn at the time and decided not to seek the seat in the special election; the Republican county chairmen from the district selected Sempolinski to run for the seat in the special election.

[5] Sempolinski defeated Max Della Pia, the Democratic nominee by a 53.1%–46.6% margin.

[12] Sempolinski defeated Democratic challenger Daniel Brown in the general election on November 5, 2024.