Born to Harold John McMahon and Florence Blanche (Herlihy) McMahon in Troy, NY.
Is an assistant scoutmaster for the Boy Scouts of America in Valley Falls, NY, through 1963.
Earns a Bachelor of Science in chemistry from Holy Cross College.
Is a chemist at Exxon Research and Engineering in Linden, NJ, through 1970.
Earns a Doctor of Philosophy in chemistry from the University of New Hampshire.
Works as a group leader and senior chemist at Union Camp Corporation in Lawrenceville, NJ, until his retirement in 1999.
Is the vice-chair of the Somerset Hills Jaycees in Bernardsville, NJ, through 1978.
Is the vice-chairman and secretary for the E-19 Committee on Chromatography within the American Society for Testing and Materials.
Works as an associate editor for the Journal of Chromatographic Science through 2018.
Serves as the associate editor for Chromatography Illustrated through 1992.
Is a member of the Knights of Columbus and presently maintains membership.
Is a member of the Vincent de Paul Society and presently maintains this role.