After making her international triathlion debut in 2009, Joanna Brown made herself known to the triathlon world with her bronze medal in the ITU World Junior Championship at the 2010 Grand Final. It was after that podium performance that she knew she wanted to represent Canada at the Olympic Games. Brown joined the national team in 2011 and made her ITU World Cup debut that season.

She had another great year in 2012 when she made her debut on the ITU World Triathlon Series, reached the podium in four Pan American Cup races, including one victory and won a bronze medal at the ITU World U23 Championships at the ITU World Triathlon Grand Final.

Career Highlights
- 3rd place WTS Bermuda
- 5th place at the 2019 Hamburg ITU Triathlon Mixed Relay World Championships
-4th place at the 2019 Accenture World Triathlon Mixed Relay Series Nottingham
-15th place at the 2019 ITU World Triathlon Yokohama
- 3rd place at the 2019 MS Amlin World Triathlon Bermuda
- 2nd place at the 2018 Sarasota-Bradenton CAMTRI Triathlon Mixed Relay American Championships
- Winner of the 2017 Ottawa CAMTRI Sprint Triathlon Premium American Cup;