Bill Iannicelli was an All-American at Franklin & Marshall College in track & field, more specifically, the javelin. He qualified for the 1948 Olympics, but did not make the Olympic team, as he finished sixth in the finals. However, at NCAA championship competition in 1947 and 1948, he finished within the top five. In the "Little Three" track meet, including Gettysburg, Dickinson and F&M, Iannicelli was involved in every meet since its inception in 1947 except one (1949, when he was a high school coach for one year). In 1947-48, Iannicelli was a competitor in the long jump and javelin.
He is quoted as saying, "The Little Three meet is very important to me because it started the first year I got back from the service and we've been doing it all these years. It's always been a very competitive meet, and I think it's one of the best traditions we have in the Middle Atlantic Conference, which is a very traditional conference. This meet is great because no team has really dominated the meet. Some years, Gettysburg has been strong. Other years, we've been strong. And while Dickinson hasn't won that often, they've always been competitive. It's a pretty evenly matched event, and that makes for good competition. I think that, plus tradition helps get kids enthusiastic about it, even today."
In 1950, he became assistant coach to Tom Floyd, and then took over as head coach in 1955. He also gained the position of head cross country coach. His career cross country record since 1955 is 217-54, which includes Middle Atlantic Conference titles in 1977 and 1983. His career track record since 1955 is 261-90 (2-0 in 1989), including MAC championships in 1968, 1969 and 1981. That gives him a career coaching record of 478-144 (76.8 winning percentage).