Party affiliation: Republican
- Tax administrator New Jersey Division Taxation, Trenton, 1976—1986, attorney, 1988—2008, since 2008, McCarthy & Schatzman PA, Princeton, 1986—1988. Member New Jersey Economic Development Council, 1987-1990.
- The Hand and the Road: The Life and Times of John A. Mackay by Metzger, John Mackay [Westminster John Knox Press, 2010] (Paperback) [Paperback]
- The Hand and the Road: The Life and Times of John A.
- The Hand and the Road: The Life and Times of John A. Mackay
- This is the first biography of John A.