McCullough was a member of the U.S. Paralympic Soccer Team at the 1996 Atlanta Games, and also competed in the 1998 World Championship and in the 1999 Pan American Games.
In his many duties off the field, McCullough was recently elected to serve as an alternate to the Athlete Advisory Council of the U.S. Soccer Federation, and serves the Federation as Chair of the Soccer for the Challenged Committee.
McCullough has spoken for the U.S. Department of Education about the educational struggles and challenges for students with disabilities, and has been a featured commentator on National Public Radio. He has also had numerous speaking engagements for the Close Up Foundation, the nation's largest non-profit, non-partisan citizenship education organization through which high school students are provided with "close up" lessons in civics.
The 35-year-old McCullough has also done extensive work with the USCPAA, the California School of the Blind, and Special Olympics. He has volunteered as an adapted aquatics instructor and as a counselor at a camp for children with cancer and conducted soccer clinics for both able-bodied and disabled youth.
In 1989 while serving the U.S. Coast Guard, McCullough suffered a traumatic head injury and permanent neck and shoulder damage in a high seas accident. Since that accident, he has dedicated much of his life to promoting and developing opportunities for individuals with disabilities.