Jim Beatty is the first person to run a sub-4:00 mile indoors which he did on February 10, 1962 when he ran 3:58.9 at the Los Angeles Invitational. The trailblazer is also the first American to run sub-3:40 for 1,500 meters, sub-8:30 at two miles and a sub-14:00 5,000 meters.
http://www.garycohenrunning.com//Interviews/Beatty.aspx
http://www.garycohenrunning.com//Interviews/Beatty.aspx