Abdullah Hussein Alkadi, Ph.D., is widely considered the world’s authority on the Hijrah and among the greatest living biographers of the Prophet (ﷺ). His books Makkah to Medina:  A Photographic Journey of the Hijrah Route and Milestones of Arabia are among the most significant studies coming from a Saudi scholar in a generation. In order to focus on his research, he recently stepped down from his role as Vice-President for Development, Studies and Communication Services at Imam Abdulrahman Bin Faisal University, University of Dammam, and as Professor of Urban and Regional Planning. He completed his doctorate in 1996 at Portland State University, Oregon. He is an architect, urban planner and historian and has authored numerous books and articles focusing on early Islamic history and civilization with a particular focus on the Hijaz. Alkadi has been praised internationally for his groundbreaking research on the various travel routes used by the Prophet Mohammad (ﷺ) and his Companions. Alkadi regularly tours the world to promote his work and share his research.