Hathaway was born in Naples, Florida, but moved to Kennebunkport, Maine with his family when he was six months old.[2] He began playing hockey in Maine around the age of three with his older brother, and would practice at home when the pond by the family house froze over in the winter.[3] In 1999, when he was seven years old, Hathaway and his family spent three months traveling around the world, a trip that his father John had planned to help "really give them the experience" of world travel.[4]
Mike Addesa, who coached Hathaway in the Hockey Night in Boston Elite Tournament in 2009, suggested that Mark White, the assistant coach for the Brown Bears men's ice hockey team, take a look at the player.[9] While attending Brown University, Hathaway studied business, entrepreneurship and organizations. During the summer after his sophomore year, Hathaway and his Bears teammate Mike Juola purchased and operated a lobster roll cart.[10]
Hathaway was part of a team of freshmen, also including Dennis Robertson, Matt Wahl, Marco de Filippo Roia, Mark Hourihan, and Jake Goldberg, that was expected to play a key role with the Bears in the 2010–11 season.[11] He scored his first collegiate point on November 5, 2010, assisting David Brownschidle in the second period of a 3–3 tie against the Quinnipiac Bobcats.[12] Hathaway later earned his first career goal in a 7–3 loss to Minnesota State at the 2011 Shillelagh Tournament championship game on January 2, 2011.[13] At the end of the season, Hathaway was one of 23 Bears, including eight freshmen, named to the 2011 ECAC Hockey All-Academic Team, given to student-athletes with at least a 3.00 cumulative grade point average on a 4.00 scale.[14]
As a sophomore during the 2011–12 season, Hathaway scored his first goal of the year on October 29, 2011, in a 3–2 victory over the Princeton Tigers.[15] He missed six games due to illness, and finished the season with only three goals and five assists.[16] On May 8, 2012, Hathaway was named one of four assistant captains for the Bears,[17] and on June 26, he was named to the ECAC Hockey All-Academic Team for the second year in a row.[18]
On May 14, 2014, Hathaway was awarded the Patrick S. Jones Memorial Trophy, a coaches' award given to the "member of the team who generates the most spark and enthusiasm in building team spirit".[19] Across his collegiate hockey career, Hathaway totaled 58 points (20 goals and 38 assists) and 178 penalty minutes in 121 games with the Bears.[20]
After spending much of the 2015–16 season with the Stockton Heat, Hathaway earned his first recall and made his NHL debut for the Flames on February 29, 2016, in a 4–3 loss to the Philadelphia Flyers.[25]
Hathaway scored his first career NHL goal on November 20, 2016, against the Detroit Red Wings.[26]
Washington Capitals
On July 1, 2019, Hathaway signed a four-year, $6 million contract with the Washington Capitals.[27]
On November 18, 2019, Hathaway was given a match penalty and was ejected from a game against the Anaheim Ducks when he intentionally spat on skater Erik Gudbranson during a fight.[28] Following the game ejection, the NHL suspended Hathaway for three games without pay, and announced that he would forfeit $24,193 to the Players' Emergency Assistance Fund as part of his punishment.[29] The Ducks' reaction to the spitting incident was vitriolic, with Gudbranson saying, "It's something you just don't do in our game, and he did it". Teammate Derek Grant added, "At the end of the day, it's probably the least respectful thing you can ever do to somebody."[30]
On February 23, 2023, Hathaway and Dmitry Orlov were traded from the Capitals to the Boston Bruins in exchange for Craig Smith, a 2023 first-round pick, a 2025 second-round pick and a 2024 third-round pick.[33]
Philadelphia Flyers
Leaving the Bruins at the conclusion of his contract, Hathaway was signed on the opening day of free agency to a two-year, $4.75 million contract with the Philadelphia Flyers on July 1, 2023.[34]
Personal life
In October 2019, Hathaway and his Capitals linemate Nic Dowd started a podcast called "Between Two Blue Lines". Rather than discussing hockey, Hathaway and Dowd use the podcast to talk about their families and other off-ice activities. He lived in Philadelphia for about a year when he was a kid.[35]