Final answer:
Sir Roger Bannister was the first man to run the mile in less than four minutes.
Step-by-step explanation:
The first man to run the mile in less than four minutes was Sir Roger Bannister. On May 6, 1954, Bannister, a British middle-distance runner, accomplished this feat at the Iffley Road track in Oxford, England. He completed the mile in 3 minutes and 59.4 seconds, breaking the previously perceived limit of a four-minute mile.