The Chief Corporate Communications Officer, NNPCL, Olufemi O. Soneye, confirmed this development.
Soneye said John died at the age of 84.
Describing him as a quintessential administrator and oil and gas industry professional, he said John was the fifth GMD of NNPC, succeeding Dr. Aret Adams, who is also late, from April 1990 to June 1992.