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Phenylalanine has been around as long as life itself, if not longer. It's not something that someone invented one day. It's like oxygen: no one invented it, it's been here as long as anyone can remember, and far longer! J. Heinrich Matthaei and Marshall W. Nirenberg figured out a way to make a bacterium produce long chains of phenylalanine molecules in 1961.
Medical Definition of PHENYLALANINE. : an essential amino acid C9H11NO2 that is obtained in its levorotatory L-form by the hydrolysis of proteins (as lactalbumin), that is essential in human nutrition, and that is converted in the normal body to tyrosineâabbreviation Phe; see phenylketonuria, phenylpyruvic acid.