Esser twice broke the American record in the 400 m hurdles in the period before it was a standard international event for women. Her first record was 58.98 seconds, set on June 11, 1976, and she improved this to 57.07 seconds on May 21, 1977. The 57.07 was winning the AIAW National Track and Field Championship at Drake Stadium.[3] Her lifetime best for the event was 56.63 seconds, set in 1979.[4]
She was a mainstay of the American women's hurdles scene in the 1970s. She won two national titles, setting a championship record of 57.3 seconds in 1975 and returning to the top in 1978.[5] She made the top three nationally in 1976, 1977 and 1979.[4] Her sole international honour was a bronze medal at the 1979 IAAF World Cup held in Montreal.[6][7]