Mack arranged an invitation for the Cuban National Youth Champions, the Lawton Juniors, came to Miami for a visit which created vast publicity for all the youth programs. He was instrumental in obtaining funds from a grant given to adult soccer by the Kennedy Foundation so that the youth programs were given greater financial support. His friend Ray Thompson was able to hire ex-English League soccer coach and Canada National team coach Tom Hayes which caused a coach’s program to be organized. In 1963 he co-founded the Florida Youth Soccer Association and served as an officer until the year 2000.
Mack was instrumental in creating the Florida State Soccer Association for adult players in 1957 and was an active officer until 2012.
The first state referee program was organized, and the Florida State Referees (FSR) was born in 1964. He directed the Florida affiliation to US Soccer and became its first representative. There were no other states in the southeast affiliated at that time. Soccer was now a new sport in Florida and he conducted many clinics for referees, coaches, players, parents and administrators. Neighboring states were seeking his assistance. For his youth and adult soccer endeavors, he received the Key to the City of Miami on two occasions. In 1965, Mack, Fred Stauber, and Ray Thompson were the first three certified referees in the southeast registered with US Soccer.
Between 1963 and 1965 Mack served on the National Team Player Selection Committee for US Soccer.
In 1966 Mack began meeting with high school athletic directors and coaches to persuade them to adopt soccer as a new scholastic sport. He did the same with college level institutions to urge the addition of soccer in their athletic programs and encouraged all to support youth soccer since it would become a source for obtaining players at the college level. In 1968 he formed the first NISOA Florida chapter and served as president for 7 years. During 1972-1973 he was one of four to referee NCAA Division 1 finals and refereed several National Junior College finals.