[1] He signed with the New York Cosmos as was named NASL Rookie of the Year and First Team all-star for the 1971 season.
[2] After the 1972 season Horton was offered a contract with Queens Park Rangers by their manager Gordon Jago.
Horton decided to remain with Cosmos and complete his master's degree at Rutgers University in New Jersey.
Horton played two more summers with the Cosmos before being traded to the Washington Diplomats for three first-round draft picks.
On 8 February 2013 he was elected unopposed as Speaker of the House of Assembly, becoming the first member of an opposition party to hold that position.