High school Johnson was raised in Miami, Florida and attended
Ransom Everglades School, where she was a four-year letter winner and starter on her school's water polo team, guiding them to three state championships. She also earned All-Dade honors throughout career, Johnson was a multi-sport athlete and competed in swimming in high school. She earned all-county honors twice in swimming. She was the state individual champion on the 50 Free event in her sophomore year. She was the first Princeton women's water polo player to be named first team All-America and she was the third ever to be selected All-America in each of her four seasons. The geographical diversity Johnson brought to the team, she was the only team member not from California, was highlighted by
SwimSwam before the Olympic Games. Her age, 21 years old, and her sub-Saharan African ancestry were highlighted by
Sports Illustrated leading up to the 2016 Olympic Games. She helped the team win the
gold medal at the Olympic Games.
Ethnikos Piraeus, Greece For the 2021-22 season, she is the goalkeeper of Greek
Ethnikos Piraeus, a club with big tradition in Greek water polo. On March 30, she won the
Women's LEN Trophy with Ethnikos Piraeus. That was the second time Ethnikos has won the title, thus becoming the Greek team with the most in the competition. Meanwhile, that was Johnson's first European club competition title.
2020 Summer Olympics Johnson also competed on the US Olympic water polo team in the
Tokyo 2020 Summer Olympics, which were held in 2021 due to the
COVID-19 pandemic. The U.S. women's water polo team again earned a gold medal. US Olympic head coach, Adam Krikorian, has said of Johnson:She's an incredible athlete. She's got great hand-eye coordination, great reflexes and reactions. And then she's fiercely competitive - fiercely. And you would never know it by her demeanor or by the huge smile on her face. But to us, on the inside, we know how driven she is to be one of the best ever to do it. ==Activism==