February 17, 1913

Wallace Coulter was born in Little Rock (Pulaski County). Coulter was an engineer, inventor, and entrepreneur who was co-founder and chairman of Coulter Corporation, a worldwide medical diagnostics company headquartered in Miami, Florida. The two great passions of his life were applying engineering principles to scientific research and embracing the diversity of world cultures. He invented the principle of using electronic impedance to count and size microscopic particles suspended in a fluid. The “Coulter Principle” is responsible for the current practice of hematology laboratory medicine.