The beliefs of Jehovah's Witnesses are based on the Bible teachings of Charles Taze Russell--founder of the Bible Student movement--and successive presidents of the Watch Tower Society, Joseph Franklin Rutherford and Nathan Homer Knorr.
The beliefs of Jehovah's Witnesses are based on "the form of Christianity that Jesus taught and that his apostles practiced". After his death successive presidents of the Watch Tower Society, we're Joseph Franklin Rutherford and Nathan Homer Knorr.