Youtube playlist of past speakers.

Past speakers (with video links) include:
2022, Karen Swallow Prior (SEBTS), video
2021, J.P. Moreland (Talbot School of Theology), Dr. Robert Garcia (Baylor), video 
2020, Michael Behe (Lehigh), Joshua Swamidass (Washington University - St. Louis), video here
2019, Robin Collins (Messiah College), Joel Velasco (Texas Tech), video, audio; Tony Reinke (Desiring God), audio; Gloria Frost (University of St. Thomas), audio
2018, J. Budziszewski, UT Austin, video here
2017: Andra Gillespie, Emory University, video here.
2016: John Lennox, Oxford University, video here.
2015: James Tour, Rice University, video here
2013: William Lane Craig, Talbot School of Theology, video here
2012: Os Guiness, Oxford Centre for Christian Apologetics, video here