[5] Her mother Teresa, a psychiatrist, was born in Pilar, Capiz, Philippines and immigrated to the U.S. as a child, and her father Steve, a neurosurgeon, once captained the Duke University fencing team.

[9] She placed 5th at the 2012 London Olympic Games, after losing to eventual silver medalist Arianna Errigo in the quarter final, 15–10.

[11] Following her win at the Long Beach Grand Prix on March 18, 2017, she moved into #1 in FIE world rankings, becoming the first American woman to hold the #1 position.

She qualified to represent the United States in fencing at the 2020 Olympics in Tokyo in 2021 and reached the final in the individual foil.

[16] Kiefer defended her gold medal in the individual foil, defeating Lauren Scruggs in the all-USA final.