Mulqueen grew up in the Fords section of Woodbridge Township, New Jersey and played soccer at St. Joseph High School.
U.S. goalkeeper Tim Howard credits Mulqueen with helping to establish his own career.
[5] Mulqueen was goalkeeper coach for the United States National Team at the 2004 Summer Olympics qualifying tournament,[6] 2005 CONCACAF U17 Tournament,[7] 2007 CONCACAF U17 Tournament,[8] 2005/2007 FIFA U-17 World Cups, 2007 FIFA U-20 World Cup, 2008 Summer Olympics and the 2009 FIFA U-20 World Cup.
[9] Mulqueen also was an assistant coach of the 1995 Lafayette College Men's Soccer team, which made it to the NCAA Division I Tournament sweet 16.
Goalkeeper Tim Howard refers to Mulqueen as one of the first coaches he truly bonded with.