Mr. McNulty graduated from Rio Grande College in 1942. He served as a flight navigator in the Navy Air Corp during World War II. "Mac" earned his secondary education degree from the University of Cincinnati in 1947.

Mac started teaching and coaching at Finneytown Elementary School in 1947. He moved to Finneytown High School with its opening in 1958 as teacher, coach, and Athletic Director. He helped create and develop both the athletic programs and physical facilities from the beginning to the total program that exists today. He was honored by having the football stadium named "The Charles ‘Mac’ McNulty Stadium" in 1995.

Mac and his wife Jimmie, a long-time kindergarten teacher in Finneytown, have four sons, Dennis, Robin, Jon and Tom, who all graduated from Finneytown.