Who discovered that the proton is 1837 times that of the electron?

The discovery that the proton is approximately 1837 times the mass of the electron is attributed to physicist Robert Millikan. He conducted experiments in the early 20th century, including the famous oil drop experiment, which allowed for precise measurements of the charge of the electron. By combining this information with the known mass of the electron, Millikan helped establish the relative mass of the proton. This ratio has since been confirmed and refined through various experimental methods.