Dr. Greenberg has authored over 280 research articles and 80 chapters, reviews, and editorials in the areas of hemorrhagic stroke and small vessel brain disease, served as principal investigator on multiple national research grants, and in leadership positions at national and international conferences on hemorrhagic stroke and vascular cognitive impairment. He has served in many national and international leadership roles in the fields of stroke and neurology including principle investigator for the NINDS MarkVCID biomarkers consortium coordinating center, President of the International CAA Association, chair of the NIH Acute Neurologic Injury and Epilepsy study section, co-chair of the NINDS Alzheimer’s Disease-Related Dementias Summit subcommittee on vascular cognitive impairment, and chair of the American Heart Association International Stroke Conference.