The YouTube description:
A lecture by Dr. Simon Gathercole at Southern Baptist Theological Seminary on the Pre-existence of Jesus. (part 1)
Gathercole is the author of The Preexistent Son: Recovering the Christologies of Matthew, Mark, and Luke.
via Pre-existence of Jesus (part 1) – YouTube. (I was able to find three segments of about 10:00 each, but I’m not sure it covers the entire lecture.)