Toni Preckwinkle is an American politician serving as the President of the Cook County Board in Illinois. She has held this position since 2010, making her one of the first women to lead the board. Preckwinkle is known for her focus on public health, criminal justice reform, and economic development in the county. Before her role in county government, Preckwinkle was an elected member of the Chicago City Council, representing the 4th Ward. She has a background in education and community organizing, which has influenced her approach to governance and policy-making throughout her career.