Myron Arms Hofer (born December 20, 1931) is an American psychiatrist and research scientist, currently Sackler Institute Professor Emeritus in the Department of Psychiatry at Columbia University College of Physicians & Surgeons. He is known for his research on basic developmental processes at work within the mother-infant relationship. Using animal models, he found unexpected neurobiological and behavioral regulatory processes within the observable interactions of the infant rat and its mother. Through an experimental analysis of these sensorimotor, thermal and nutrient-based processes, he has contributed to our understanding of the impact of early maternal separation, the origins of the attachment system, and the shaping of later development by variations in how mothers and infants interact.[1][2][3]