Niemerg was born in Teutopolis, Illinois to his parents Phil and Stephanie. He would be the oldest of five children. He graduated from Teutopolis High School in 2002. He would attend Lake Land College until later attending Eastern Illinois University and earned his Bachelor of Arts in history. After graduating, he would work as a senior claims adjuster for Country Financial for 12 years. He is a member of the American Farm Bureau Federation. In the aftermath of the storming of the US Capitol by a mob of Trump supporters, Niemerg condemned the violence. However, Niemerg claimed there was "credible questions" surrounding the results of the 2020 presidential election.