where is he from?
Surrey (now London), England.
Early years
Karloff was born William Henry Pratt on 23 November 1887, at 36 Forest Hill Road, Dulwich, Surrey (now London), England. 
who played the mummy in the old movies Boris Karloff has he also acted in any other film? Yes - Frankenstein (1931), Bride of Frankenstein (1935) and Son of Frankenstein (1939).
England. Surrey, England. Surrey (now London), England
Boris Karloff Boris Karloff Boris Karloff
Early years Early years Early years
Karloff was born William Henry Pratt on 23 November 1887, at 36 Forest Hill Road, Dulwich, Surrey (now London), England.  Karloff was born William Henry Pratt on 23 November 1887, at 36 Forest Hill Road, Dulwich, Surrey (now London), England. Karloff was born William Henry Pratt on 23 November 1887, at 36 Forest Hill Road, Dulwich, Surrey (now London), England. 
wiki:13386799
Boris Karloff [SEP] Early years
Karloff was born William Henry Pratt on 23 November 1887, at 36 Forest Hill Road, Dulwich, Surrey (now London), England. His parents were Edward John Pratt, Jr. and Eliza Sarah Millard. His brother, Sir John Thomas Pratt, was a British diplomat. Edward John Pratt, Jr. was an Anglo-Indian, from a British father and Indian mother, while Karloff's mother also had some Indian ancestry, thus Karloff had a relatively dark complexion that differed from his peers at the time. His mother's maternal aunt was Anna Leonowens, whose tales about life in the royal court of Siam (now Thailand) were the basis of the musical "The King and I".