A native of
East Boston, Greer was a member of the East Boston Amateur Athletic Boat Club. He held the
National Association of Amateur Oarsmen single sculls title from 1904 to 1095. On July 30, 1904, he won an Olympic gold medal in the
single sculls competition with a time of 10:08.5 at the age of 25. The final was held at
Creve Coeur Lake in
Maryland Heights, Missouri, where he beat out
James Juvenal (silver) and
Constance Titus (bronze). ==After rowing==