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James Edward Bailey (1944 – 9 May 2001), generally known as Jay Bailey, was a pioneer of biochemical engineering, particularly metabolic engineering. He was said to be "the most influential biochemical engineer of modern times". He is commemorated in the James E. Bailey Award for Outstanding Contributions to the Field of Biological Engineering, by the AIChE Society for Biological Engineering. His numerous contributions in biotechnology and metabolic engineering have led to multiple awards including the First Merck Award in Metabolic Engineering.