[4] His brother Ryan Warsofsky is the NHL ice hockey head coach for the San Jose Sharks.

[6] Warsofsky was captain of the 2007–08 Under-18 United States men's national ice hockey team, where he tied as leader in assists and was second in points.

Instead of turning pro immediately, he played for Boston University in the Hockey East and was a member of the 2009 national championship team as a freshman.

[4] On June 26, 2010, the Blues traded Warsofsky's rights to the Boston Bruins in exchange for Vladimír Sobotka.

[16] Aside from a 16-game stint with the Avalanche in the 2017–18 season, he primarily played for the team's affiliates, the San Antonio Rampage and the Colorado Eagles.

On August 25, 2020, Warsofsky was traded by the Penguins to the Toronto Maple Leafs along with Evan Rodrigues, Filip Hallander, and the 15th overall pick in the 2020 NHL Entry Draft in exchange for Kasperi Kapanen, Jesper Lindgren and Pontus Aberg.

[20] In the 2020–21 season, the Hurricanes assigned Warsofsky to join AHL affiliate, the Chicago Wolves, to be coached by his brother Ryan.