Born in 1927 in Los Angeles, California, Rousselot attended the public schools of San Marino and South Pasadena.

He served as deputy to the chairman of the California Board of Equalization in 1956, and was director of public information for the Federal Housing Administration in Washington, D.C., from 1958 to 1960.

During the next few years, Rousselot worked as a management consultant and as Western regional director for the ultraconservative John Birch Society.

In the Republican primary for the 1970 special election, he narrowly edged out former congressman Patrick Hillings and former football star and doctor Bill McColl.

He was an unsuccessful candidate for nomination to the One Hundred Third Congress in 1992 in the newly redrawn 25th Congressional District, which ultimately was won by Republican Howard McKeon.