Ilija Josifov is the most often encountered Latin transliteration; but you'll also find him as Ilia or Iliya, and respectively as Yosifov or Iosifov.
Ilija Josifov was born in Kotel during April 1912. As a child, he studied violin. His career began first as a lawyer after graduating from the Department of Law in Bulgaria.
I wish to thank Vladimir Efimenko for compiling this page; source for most of the material: University of Pittsburgh.