james gosling.
from
here:
"Sun Microsystems' James Gosling, widely known as the father of the Java programming language"
the article seems a little generous, though. many people would name patrick naughton as the main creator of java, though his name has been erased from history by his own doing. then again, that article also says gosling created a "text editor called 'Emacs'", which is pretty far from the truth.