Career
Nicknamed Louisiana Dinamita, Mullins started his career with Cartaginés before joining Alajuelense in 1995 and returning to Cartaginés two years later. He had a stint on loan in Guatemalan football with Universal Service Administrative Company in 1999 amid controversy about a fee the Guatemalans had to pay Cartaginés for the loan. In January 2000, he returned to Costa Rica to play for Herediano.
Mullins denied reports of a possible retirement in November 2008, citing he would love to play on for Cartaginéson
He eventually retired in 2008 and was given a farewell match in October 2009. In 2007 he was joint Costa Rican record holder in having served seven different Costa Rican clubs.
His final international was a February 1998 CONCACAF Gold Cup match against the United States. Mullins is rated in the top 20 goalscorers in the first division of Costa Rica with 110 goals.
After retiring as a player, Mullins became assistant coach at Cartaginéson