Mark Barr lost his right leg as a teenager due to bone cancer.
Barr competed in swimming at the Athens 2004 and Beijing 2008 Paralympic Games.
During this time, he was also an NCAA Division I swimmer for California Polytechnic State University from 2004-08.
After college, he still had an interest in swimming, but wanted to try something new so he decided to transition to triathlon.
Some of his more recent accomplishments include being awarded the 2019 ESPY for Best Male Athlete with a Disability and being named the 2018 USA Triathlon Male Paratriathlete of the Year.
Barr currently works as a registered nurse in the trauma surgical ICU, working multiple 12-hour shifts a week.
He uses his days off to fit in training sessions for all three disciplines. His favorite professional sports teams are the San Francisco Giants and the 49ers.

Most recent: 2018 – gold (PTS2 - Men)
Years of participation: PTS2 - Men 2017, 2018; PT2 - Men 2014, 2015, 2016; TRI-2 - Men 2012, 2013; 100m Butterfly S9 - Men 2006; 100m Freestyle S9 - Men 2006; 4 x 100m Medley Relay 34 Points - Men 2006; 400m Freestyle S9 - Men 2006; 50m Freestyle S9 - Men 2006
Medals: 6 (1 gold, 3 silver, 2 bronze)

Paralympic Games Paris 2024, bronze (PTS2 - Men)
Paralympic Games Rio de Janeiro 2016, 4th (PT2 - Men)
Paralympic Games Beijing 2008, 6th (4 x 100m Freestyle Relay 34 Points - Men), 7th (4 x 100m Medley Relay 34 Points - Men), 8th (100m Butterfly S9 - Men), 9th (400m Freestyle S9 - Men), 17th (100m Freestyle S9 - Men), 18th (50m Freestyle S9 - Men)
Paralympic Games Athens 2004, 4th (100m Butterfly S9 - Men, 400m Freestyle S9 - Men), 5th (4 x 100m Freestyle Relay 34 Points - Men), 7th (4 x 100m Medley Relay 34 Points - Men), 9th (100m Freestyle S9 - Men), 11th (100m Backstroke S9 - Men), 12th (50m Freestyle S9 - Men)