1942
Born to Harold John McMahon and Florence Blanche (Herlihy) McMahon in Troy, NY.
1960
Is an assistant scoutmaster for the Boy Scouts of America in Valley Falls, NY, through 1963.
1963
Earns a Bachelor of Science in chemistry from Holy Cross College.
1967
Is a chemist at Exxon Research and Engineering in Linden, NJ, through 1970.
1968
Earns a Doctor of Philosophy in chemistry from the University of New Hampshire.
1970
Works as a group leader and senior chemist at Union Camp Corporation in Lawrenceville, NJ, until his retirement in 1999.
1974
Is the vice-chair of the Somerset Hills Jaycees in Bernardsville, NJ, through 1978.
1982
Is the vice-chairman and secretary for the E-19 Committee on Chromatography within the American Society for Testing and Materials.
1988
Works as an associate editor for the Journal of Chromatographic Science through 2018.
1990
Serves as the associate editor for Chromatography Illustrated through 1992.
1995
Is a member of the Knights of Columbus and presently maintains membership.
2000
Is a member of the Vincent de Paul Society and presently maintains this role.