Joseph was one of the eight players called up to the Lightning for their training camp prior to the 2020 Stanley Cup Playoffs. Following the death of George Floyd and shooting of Jacob Blake, Joseph worked alongside goaltender Curtis McElhinney in creating a mask to represent social justice. The end product featured Black athletes who were trailblazers in the fight for equality, a fist flanked by the words Black Lives Matter and a Martin Luther King Jr. quote.