My attention turned more to the nature of the principal brain abnormality in preterm infants and ultimately the combination of white and gray matter disturbances I have termed the “encephalopathy

of prematurity.” Around the turn of the century, work with Petra Huppi (now Chief of Child Development PI3K inhibitor in Geneva) and Terrie Inder (now Chair of Pediatric Newborn Medicine at Harvard) used advanced magnetic resonance techniques to define the macrostructural and microstructural features of this abnormality. Many investigators also have contributed importantly to these aspects of neonatal neurology. Some prominent figures are Jim Barkovich (University of California at San Francisco [UCSF]), Steve Miller (Toronto, following UCSF, and Vancouver), David Edwards (United Kingdom), Jeff Neil (Harvard, following Washington University in St Louis), Robert McKinstry (St. Louis), Linda de Vries (The Netherlands), and James Boardman (United Kingdom). Meanwhile,

my work in the laboratory focused intensively on the mechanisms of injury in cerebral white matter in the preterm infant and the interventions to prevent that injury. An especially productive fellow (among many other excellent fellows during this era) was Stephen Back, now leader of his own excellent research program in Portland, Oregon. My colleagues in this mechanistic Epacadostat work have been Paul Rosenberg (Harvard) and Frances Jensen (now Chair of Neurology at the University of Pennsylvania). This work was funded for many years by the National Institutes of Health as a Program Project. We have been stimulated by such figures as Donna Ferriero (UCSF), David Rowitch (UCSF), Pierre Gressens Beta adrenergic receptor kinase (Paris and London), and Henrik Hagberg (Sweden and London). In the past 15-20 years, I have also focused especially on the anatomic aspects of the brain abnormality in preterm infants, with my great friend and inspiring colleague, Dr. Hannah Kinney. The results of advanced techniques to study human brain, i.e., immunocytochemistry,

computer-based quantitation, Western blotting, in situ hybridization, and other modern cellular and molecular methods (see later), have convinced us that a return to the study of neonatal anatomy and pathology in human brain is essential for future progress in neonatal neurology. We have been stimulated in this work by such figures as Pasko Rakic (Yale), Carla Shatz (Harvard), and Ivan Kostovic (Croatia). In my nearly half a century in neonatal neurology, I have learned many lessons. Some of them have involved the politics of academic medicine, and these lessons are hardly worth recounting. However, a select few lessons related to neonatal neurology per se are more worthy of discussion. I will confine myself to the five most prominent. I am often asked to illustrate how I perform a neurological examination of the infant.