I am Dr. Saeed Ullah Khan a mathematician and theoretical physicist specializing in applied mathematics, differential geometry, modified gravity, and relativistic astrophysics. I am currently a Postdoctoral Fellow at Fuzhou University, China, and holds a PhD in Applied Mathematics from Zhengzhou University, China. My research focuses on black holes, compact objects, modified gravity, particle dynamics, QPOs, energy extraction, and quasinormal modes, employing analytical, numerical, and dynamical-systems approaches. I authored 30+ SCI-indexed publications, with 880+ citations and an h-index of 19. With over a decade of university teaching and research experience, my academic interests span mathematics, theoretical physics, computational methods, and astrophysics, with a particular emphasis on connecting rigorous mathematical techniques with contemporary problems in gravitational physics.