During his time running at the
University of New Mexico (UNM, 1959–1963), Plummer was a member of an outstanding Lobos track team. In 1961, Plummer became the
NCAA champion in the 440 yards event. He was a three-time All-American and won four titles in the 440 yards event and three at 220 yards in the
Skyline Conference and
Western Athletic Conference (WAC). On May 25, 1963, running in his last race for UNM at the WAC Championships in Tempe, Arizona, Plummer shocked future Olympic champion
Ulis Williams on his home track with a 44.9 second world record in the 440 yards (Williams also broke the old world record by 0.1 second). Plummer shattered the old mark set by
Glenn Davis five years previously by the huge margin of 8 tenths of a second. Plummer's only memory of the race was hearing the starter say "set" before the race began. Plummer's time also tied the existing world record in the shorter
400 meters (440 yards is 402.34 meters). This was the first ever 440 run under 45 seconds. In 1964, Plummer attempted to qualify for the Olympic Games but trailed in his heat due to the flare-up of an arthritic knee, a condition that was to eventually end his athletics career. In 1965, Plummer returned to the track specializing in the 220 yard/200 meter event. That year he became USA national champion at 220 yards and was ranked number one in the world at that distance.(
See below). == Accolades and awards ==