Jack B. St. Clair begins with a description of his background and early childhood in Roanoke, Virginia, where his extended family was involved with the railroad. His father's work with the Public Health Service in 1931 led the family to Shreveport, Louisiana, a center for the oil and gas industry, where St. Clair was first exposed to engineering. Excelling in science and math, he won several scholarships and with the guidance of his high school principal decided upon chemical engineering studies at Tulane University. He graduated in 1940 and accepted a position as technical trainee, gas department, at Shell Oil Company's Houston, Texas refinery. During World War II, he worked in sulfuric acid alkylation and toluene extraction plants and was promoted to control laboratory assistant manager. In 1945 he became assistant manager, manufacturing technological department, New York, then moved to the Wood River, Illinois refinery, where he advanced through a series of assistant managerships before becoming department manager of catalytic reforming, gaining experience with facilities' operations and later with design work through his 1954 return to New York as assistant manager, head office, manufacturing technical department. Despite the lack of formal training, St. Clair readily accepted increasing responsibilities, recognizing he was being groomed for higher management. In 1956 he was sent to the Martinez, California refinery as assistant superintendent and undertook a six-month study of the outlook for West coast operations. The study and ensuing arguments proved good training for St. Clair, whose next position was plant superintendent in Wilmington, California; with responsibility for all operations, he acquired experience with government and environmental concerns. After briefly serving as Houston refinery superintendent, he followed mentor H. M. L. Love's urging and reluctantly moved to England as Shell International Petroleum Company, North American Division head. In this and subsequent positions as New York Head Office general manager, he interacted with top Shell executives, acquiring experience which proved key to his success. In 1965 he became a Brookings Institution public affairs fellow, gaining training and insight in government-business interactions through assignments with the U. S. Interior and Congress. He returned to Shell Transportation and Supplies as general manager then vice president, but was quickly promoted to Shell Chemical Company president in 1967, a position he occupied until his retirement in 1979. As president he undertook a major reorganization, focusing on expanding olefins business and integrating the oil and chemical sides of the company; his success is reflected in growth in sales and profits at Shell Chemical during his presidency. Here St. Clair describes relationships with Shell Oil Presidents H. Bridges and J. F. Bookout, the energy crisis, and Shell's experience with detergents and Saudi Arabian crude oil. Also discussed are fragmentation and government control in the chemical industry; the EPA; and creativity, innovation, and new technology. The interview ends with reflections on St. Clair's Society of Chemical Industry and Tulane University awards and a description of his children's careers.