Frank Greer, MD, FAAP is an emeritus professor of pediatrics and nutritional science at the University of Wisconsin-Madison School of Medicine. Board certified in pediatrics and neonatal-perinatal medicine, he earned his medical degree from the University of Pennsylvania, and he completed his residency and fellowship at Children's Hospital Medical Center in Cincinnati.

He was a member (and past chairman) of the American Academy of Pediatrics Committee on Nutrition, and he has served for many years on the Executive Committee of the International Society for Research in Human Milk and Lactation. Doctor Greer has published numerous articles on pediatric nutrition, and he has served as an editorial board member for pediatric and nutrition journals, and is co- editor of the AAP's Pediatric Nutrition Handbook. He has served on numerous national committees involving nutrition of both term and preterm infants.

Dr. Greer has published many papers nutritional requirements of breastfeeding infants and lactating mothers, including calcium, phosphorus, vitamin D, and iron. Many of these required breast milk analysis in his laboratory.

Steven Abrams, MD, FAAP, is a professor of pediatrics at the University of Texas at Austin and is a practicing neonatologist. He is board certified in pediatrics and neonatal-perinatal medicine. He earned his medical degree from the Ohio State University College of Medicine and completed his pediatric residency at Akron Children's Hospital and his fellowship at Baylor College of Medicine in Houston.

He was a member (and past chairman) of the American Academy of Pediatrics Committee on Nutrition and is currently the Editor-in-Chief of Advances in Nutrition: An International Review Journal, published by the American Society for Nutrition. He has recently served on several National Academies of Science and Medicine panels related to infant nutrition. He has published over 350 peer-reviewed articles largely related to childhood nutrition, especially mineral requirements and preterm nutrition.