Here is a collection of videos both documentary and seminar style of Dr. Michael Heiser’s work.
Aliens and demons evidence of the unseen realm documentary film (1:15:39)
Angels series (11 videos as a playlist – no longer than 15:30)
Demons documentary film (45:08)
Reversing Hermon lecture about the book of 1 Enoch and the Watchers (2:51:08)
Supernatural Seminar with Dr.Michael Heiser Part 1 (51:55)
Supernatural Seminar with Dr. Michael Heiser Part 2 (54:41)
Supernatural Seminar with Dr. Michael Heiser Part 3 (1:24:55)
Supernatural Seminar with Dr. Michael Heiser Part 4 (1:25:30)
Unseen realm documentary film (1:11:49)
Unseen Realm documentary Q & A (1:13:53)
All these are also available as books (apart from aliens and demons evidence and the Q & A)