Welcome to my personal website. I am Sebastiaan Selvi, a physicist specializing in theoretical astrophysics. Currently, I am a postdoctoral researcher holding an MPPC Fellowship in the Department of Astronomy & Astrophysics at Columbia University in New York City. My research focuses high-energy astrophysics, exploring the most extreme phenomena and environments in the universe, involving black holes, neutron stars, and relativistic plasma physics. You can read more about my research here, see my publications here, and contact me here.