Erwin Roy John (August 14, 1924 – February 28, 2009) was a pioneer in the field of quantitative electroencephalography and neurometrics.
Erwin (E.) Roy John was born in Brownsville, Pennsylvania, United States.
His attendance at City College of New York was interrupted by World War II, where he volunteered and served in the Battle of the Bulge.
After the war, he attended University of Chicago earning a BA in physics and a PhD in psychology.
John was interested in politics from childhood; in college, he founded a group to oppose McCarthyism; he was involved in the opposition to the Vietnam War and made frequent visits to Cuba.