John W. Mannion (born July 8, 1968) is an American educator and politician who has served as the U.S. representative from New York's 22nd congressional district since 2025. He previously served as a state senator from the 50th district between 2020 and 2024. Before entering politics, Mannion was a high school biology teacher.
Mannion was elected in 2020 to the New York State Senate, defeating Republican Angi Renna and became the first Democrat to hold the seat in more than 50 years. He then won the 2024 U.S. House election against incumbent Brandon Williams.
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Early life and education
Mannion was born and raised in Syracuse, New York, and is the grandson of Irish immigrants. His mother worked for New York Telephone and his father was employed by New York Central Railroad.
Mannion attended Bishop Ludden High School and later graduated from Binghamton University with a bachelor of science's degree in biology. He went on to earn a Master of Science in secondary science education from SUNY Oswego.
Teaching career
After completing his studies, Mannion became a high school biology teacher. He taught in the West Genesee Central School District, where he also served as president of the West Genesee Teachers' Association. Before this he taught at Nottingham High School and Christian Brothers Academy.
New York State Senate
In 2018, Mannion ran for the New York State Senate in the 50th district but narrowly lost to the incumbent, Republican Bob Antonacci. He ran again in 2020 and won the seat with 52.57% of the vote, defeating Republican Angi Renna.
Mannion's 2022 re-election campaign was closely contested. On election night, Republican candidate Rebecca Shiroff led by 396 votes before absentee ballots were counted. A recount ultimately declared Mannion the winner, with a margin of 10 votes, making it the closest race in the 2022 New York State Senate elections.
In 2023, Mannion announced his candidacy for New York's 22nd congressional district in the 2024 election, choosing not to seek re-election to the Senate. In June 2024, three former staffers accused Mannion and his wife of creating a hostile work environment. After an investigation, he was cleared of any wrongdoing.
Committee assignments
Mannion was the chairperson of the Committee on Disabilities. He also served as a member of the following committees:
The Committee on Children and Families
The Committee on Civil Service and Pensions
The Committee on Education
The Committee on Environmental Conservation
The Committee on Housing, Construction and Community Development
The Committee on Internet and Technology
U.S. House of Representatives
Elections
Mannion won the 2024 Democratic primary for the U.S. House of Representatives in New York's 22nd congressional district. He defeated Sarah Klee Hood and went on to face incumbent Republican Representative Brandon Williams.
Tenure
In 2026, he voted for an amendment by Thomas Massie to a State Department appropriations bill to eliminate all regularly appropriated US aid to Israel.
Committee assignments
For the 119th Congress:
Committee on Agriculture
Subcommittee on Conservation, Research, and Biotechnology
Subcommittee on Commodity Markets, Digital Assets, and Rural Development
Committee on Education and Workforce
Subcommittee on Early Childhood, Elementary, and Secondary Education
Subcommittee on Health, Employment, Labor, and Pensions
Caucus membership
Congressional Equality Caucus
New Democrat Coalition
Labor Caucus
Personal life
Mannion is married to his wife, Jennifer. They have three children.