Boyd began his career with Hertha BSC II (reserve team of Hertha BSC) in 2009 and remained with the club until 2011. He made 44 appearances, scoring 15 goals and adding six assists in all competitions. He then signed with German Bundesliga club Borussia Dortmund and played one season with their reserve squad Borussia Dortmund II. He made 32 appearances with 20 goals and five assists in all competitions. Ahead of the 2012 season, Boyd signed with Austrian club Rapid Wien. In his first season the club earned a top three finish in the table and secured a third qualifying round place in the 2013-14 UEFA Europa League. During his three years with Rapid Wien, he made 80 appearances, scoring 37 goals and 11 assists in all competitions. Rapid Wien sold him to RB Leipzig (Austria) in the summer of 2014 and remained with the club before joining Darmstadt in 2017.
Boyd joins the Reds after spending three seasons with SV Darmstadt 98 in Germany’s 2. Bundesliga, making 44 appearances and registering five goals and two assists. Boyd has earned 14 caps with the U.S. National team. He made his debut on February 29, 2012 in a friendly match against Italy. His most recent cap came on October 11, 2016, where he came on as a substitute in a 1-1 friendly against New Zealand.