Career
Swenson was the world leader at 800 meters in 1970 and competed in the 1972 Summer Olympics in Munich. Swenson set his personal best for 800 meters, 1:44.8, on July 16, 1970 in Stuttgart in a dual meet between the United States and West Germany. The time was the fastest in the world that year and a new American record for the metric distance.
Track & Field News ranked Swenson the world"s second-best half-miler that year, behind Yevgeniy Arzhanov of the Soviet Union.
At the 1972 Olympic Trials Swenson ran 1:45.1, his best time since 1970. He lost to Dave Wottle (who equaled the world record of 1:443) and Rick Wohlhuter, but took the third and final Olympic qualifying spot ahead of early leader Jim Ryun.
At the Olympics in Munich Swenson qualified from his heat, but was disqualified in the semi-finals. Swenson continued his career for several more years.
In March 1975 he joined the International Track Association (Industry Training Authority), a professional circuit.
Swenson set his personal best for the mile run, 3:59.1, in an Industry Training Authority meet on May 3, 1975. He was the 75th American to run a four-minute mile.