He covered the revolution led by Fidel Castro in the late Fifties and later reported from Nicaragua, Grenada and Angola, where Castro was involved in conflicts. Mallin was also a research scientist at the University of Miami, editing three books there. After that he became Latin American correspondent for The Washington Times, followed by the position of News Director in the 1980s as News Director at Radio Marti, which broadcast to Cuba from Washington. Mallin has authored 12 books, most on military topics.