Vollmer has won a total of thirty two medals in major international competitions, including nineteen gold medals, eight silver, and five bronze, spanning the Olympics, the World Championships, the Pan American Games, the Pan Pacific Championships, and the Goodwill Games.
In 2003, Vollmer underwent heart surgery to correct a condition called supraventricular tachycardia, which produces a quickened pulse rate of about 240 beats per minute. After that surgery, an electrocardiogram indicated to her cardiologists that she might have the Long QT Syndrome. Then, further testing ruled out this condition. In any case, her physicians recommend that she always have a defibrillator at the poolside whenever she swims in case of a heart emergency.
Vollmer is an avid ambassador of the American Heart Association’s program called “Go Red for Women.”
She is married to Andy Grant, a former swimmer for Stanford University. The couple announced they were expecting their first child on October 10, 2014.