In 1974, at the age of 40, he was named director of ORNL, a post he held until his retirement in 1988. A native of Wilmington, North Carolina, he attended Duke and Harvard universities and did three summer terms at ORNL beginning in 1954.
ORNL's current strong ties to the University of Tennessee and relationships with other partner universities are also rooted in Postma's tenure as ORNL director.