Abdulhadi (Hadi) is a Ph.D. Candidate in the Disaster Science & Management program at the University of Delaware. He holds an MSc degree in Emergency Health Services (Preventive Medicine & Epidemiology track) from the University of Maryland-Baltimore County, the USA, and a BSN degree from the College of Health Sciences at the University of Dammam, Saudi Arabia. Also, he has a GIS certificate from UD and a graduate certificate in Emergency Management from the University of Maryland-Baltimore County. After the BSN, Abdulhadi worked as a registered nurse in two hospitals in Saudi Arabia. Then, he worked as a teaching assistant in the Department of Emergency Medical Services at Umm Al-Qura University, Saudi Arabia. Abdulhadi’s research interests include public health emergencies, collective behavior, and mass gathering medicine.