He qualified for the Foot Locker Cross Country Championships in his junior and senior years of high school and finished sixth in 2002 and 10th in 2003. Collegiate
Heath graduated high school and attended Stanford University, where he was a nine-time All-American (placing in the top 8 at the national championships in track and field or 35 in the single-event NCAA cross-country championships) including leadoff leg to the championship distance-medley relay team in the 2007 NCAA Indoor Track and Field Championships. He specialized in the 1500, mile and 5K and was one of the lead runners for the Stanford cross-country team. He broke the 4-minute mile barrier in 2007. He was one of only three collegians along with teammate Russell Brown and Leonel Manzano to run a mile in under four minutes that year. Heath was also the runner-up to Oklahoma State University's German Fernandez in the 2009 NCAA Outdoor Track and Field Championships. Post-collegiate
As a professional, Heath runs for Brooks, training with the Brooks Beasts track club. In 2012, the Olympic year, he was ranked 4th among US distance runners in the mile and the 1500 indoors although he was ranked 8th among U.S. metric milers in outdoor track and finished ninth in his semifinal heat, thus failing to qualify for the 2012 Olympic Team. Heath defeated Leonel Manzano in 2013 to win the USA 1 Mile Road Championship. Heath won the 2014 Silicon Valley Turkey Trot in 13:54.
He qualified for the Foot Locker Cross Country Championships in his junior and senior years of high school and finished sixth in 2002 and 10th in 2003. Collegiate
 Heath graduated high school and attended Stanford University, where he was a nine-time All-American (placing in the top 8 at the national championships in track and field or 35 in the single-event NCAA cross-country championships) including leadoff leg to the championship distance-medley relay team in the 2007 NCAA Indoor Track and Field Championships. He specialized in the 1500, mile and 5K and was one of the lead runners for the Stanford cross-country team. He broke the 4-minute mile barrier in 2007. He was one of only three collegians along with teammate Russell Brown and Leonel Manzano to run a mile in under four minutes that year. Heath was also the runner-up to Oklahoma State University's German Fernandez in the 2009 NCAA Outdoor Track and Field Championships. Post-collegiate
 As a professional, Heath runs for Brooks, training with the Brooks Beasts track club. In 2012, the Olympic year, he was ranked 4th among US distance runners in the mile and the 1500 indoors although he was ranked 8th among U.S. metric milers in outdoor track and finished ninth in his semifinal heat, thus failing to qualify for the 2012 Olympic Team. Heath defeated Leonel Manzano in 2013 to win the USA 1 Mile Road Championship. Heath won the 2014 Silicon Valley Turkey Trot in 13:54.