Born in Concord, California, Manoa was encouraged to play rugby by his coaches, his father and uncle, at the age of 13. Manoa joined San Francisco Golden Gate during the US Super League era from 2003 to 2010 and helped Gate win two titles before getting his USA Rugby call-up. He made his international debut for the Eagles against Georgia in the fall of 2010, kickstarting a national team career that spanned into 2018 with 21 caps and selection to the 2015 World Cup. Manoa left the states in 2011 after getting an offer from Northampton of the English Premiership. He was a member of the Saints for four years, playing in 84 matches and scoring a total of 16 tries. Manoa left England in 2015 when Toulon of the French Top 14 contracted him. After three years with the prestigious French club, he headed to Guinness PRO14 competition with the Cardiff Blues.
Manoa’s internationally known prowess added tremendous skill and experience to a strong Seawolves squad as a back row-lock in 2019 when he debuted in Major League Rugby. Manoa made five appearances for the Seawolves, including the 2019 Championship victory over the San Diego Legion. Manoa, nicknamed ‘The Hitman’, brings size, power and physicality to the game.