"[5] In his three years playing football for Michigan, the Wolverines won three straight Big Ten titles and had an overall record of 24 wins, one loss and two ties.

In June 1942, Williamson was commissioned a lieutenant junior grade in the United States Naval Reserve entered the U.S.

In the two years before Williamson was hired, the Lafayette football team won only 3 games, lost 14 and tied 1.

[12] In January 1951, Williamson was approached by the University of Southern California about taking the head coaching job for the Trojans.

[13] In 1953, the Saturday Evening Post published an article on Williamson titled, "That Gentlemanly Coach at Wisconsin."

The article's author, Harry Paxton, wrote: "Ivy Williamson is a big, unruffled Midwesterner from a small Ohio farm town.

[15][16] During Williamson's 13 years as athletic director, he increased the capacity of Camp Randall Stadium to 77,000 with the construction of an upper deck, expanded intramural facilities, restored men's ice hockey as a varsity sport, and built a new natatorium, a new baseball field and running track.

[17] In 1955, the University of Wisconsin announced that the newly established Ivy Williamson Trophy would be presented each year to the senior football player showing the highest degree of sportsmanship throughout his career.

[19] In January 1963, Williamson was elected permanent chairman of the NCAA Football Rules Committee.

[20] The football program continued to thrive into the early 1960s, but went into a steep decline later in the decade, finishing 8–19 from 1964 to 1966 and then having consecutive winless seasons in 1967 and 1968.

[17] Less than six weeks after his firing, Williamson died from irreversible brain stem damage after falling down the basement stairs at his home in Maple Bluff, Wisconsin.