Charles Taze Russell, better known during his lifetime as Pastor Russell, was a prominent early 20th century Christian restorationist minister from Pittsburgh, Pennsylvania. He was the founder of what is now known as the Bible Student movement. He was also the first president of the Watchtower Bible & Tract Society, now known as the Jehovah's Witnesses.

Beginning in July 1879, Russell began publishing a monthly religious journal, Zion's Watch Tower and Herald of Christ's Presence. The journal is now published by Jehovah's Witnesses on a semi-monthly basis under the name The Watchtower Announcing Jehovah's Kingdom. In 1881, he co-founded Zion's Watch Tower Tract Society and in 1884 the corporation was officially registered, with Russell as president. Russell wrote many articles, books, tracts, pamphlets and sermons, totaling approximately 50,000 printed pages. From 1886 to 1904, he published a six-volume Bible study series originally entitled Millennial Dawn, later renamed Studies in the Scriptures, nearly 20 million copies of which were printed and distributed around the world in several languages during his lifetime.

Russell was a charismatic figure, but claimed no special revelation or vision for his teachings and no special authority on his own behalf. He stated that he did not seek to found a new denomination, but instead intended merely to gather together those who were seeking the truth of God's Word "during this harvest time". He wrote that the "clear unfolding of truth" within his teachings was due to "the simple fact that God's due time has come; and if I did not speak, and no other agent could be found, the very stones would cry out." He viewed himself—and all other Christians anointed with the Holy Spirit—as "God's mouthpiece" and an ambassador of Christ. Later in his career, he accepted without protest that many Bible Students viewed him as the "faithful and wise servant" of Matthew 24:45, and was described by the Watch Tower after his death as having been made "ruler of all the Lord's goods".

After Russell's death, a crisis arose surrounding Rutherford's leadership of the society, culminating in a movement-wide schism. As many as three-quarters of the approximately 50,000 Bible Students who had been associating in 1917 had left by 1931, resulting in the formation of several groups that retained variations on the name Bible Students. Those who maintained fellowship with the Watch Tower Society adopted the name Jehovah's Witnesses in 1931, while those who severed ties with the Society formed their own groups, including the Pastoral Bible Institute in 1918, the Laymen's Home Missionary Movement in 1919, and the Dawn Bible Students Association in 1929.

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