William J. Seymour was an African American preacher and the leader of the Azusa Street Revival in Los Angeles, which began in 1906. He is considered one of the most influential figures in the Pentecostal movement. Seymour’s teachings focused on the baptism of the Holy Spirit and speaking in tongues, which became key aspects of Pentecostalism. The Azusa Street Revival attracted diverse followers, including many African Americans, and it is credited with spreading Pentecostalism globally. Seymour’s leadership and the revival itself had a profound impact on modern Christian denominations, particularly those emphasizing charismatic worship and spiritual gifts.