He was born in Hollywood, Calif., and came to Princeton from Phillips Exeter Academy. Mack majored in politics and wrote his thesis on Mexican immigration to the United States. He was a member of Cottage Club.
Following graduation, Mack served as a second lieutenant in the U.S. Airborne Artillery and was a master parachuter with the “Red Devils” unit. After leaving the service Mack began working with the investment firm Reynolds & Co. and then moved to Dallas, Texas, where he became an executive with Murchison Brothers, handling securities analysis, investigation, and acquisition of companies.
Alcoholism haunted him until he found and maintained sobriety for the last 40 years of his life. During that time he was strengthened by his Christian faith and worked with many others struggling with alcoholism and chemical depression, bringing them understanding and hope.
Mack is survived by two sons, a daughter, and four grandchildren, as well as three of his five stepchildren and six stepgrandchildren.