Grover Norquist is an American political activist and founder of the advocacy group Americans for Tax Reform. He is best known for his strong opposition to tax increases and his role in promoting the Taxpayer Protection Pledge, which encourages politicians to commit to not raising taxes. Norquist has been influential in conservative politics, particularly within the Republican Party. He has worked to unite various factions of the party around the common goal of reducing taxes and limiting government spending, making him a significant figure in American political discourse.