Is William J. Seymour the founder of the Apostolic Pentecostal denomination?

Yes and no. One God is the stater of all movements in His Name. Ok Will Seymour did start a movement ,but I wouldn't say that his beliefs about spiritual gifts was the cornerstone for the Pentecostal movement. I believe their were a few movements combined to create the Pentecostal denomination, and Will's is one of them. I really like researching thee early Pentecostal movement.