Most of his videos are quite long, but In my opinion Andreas is one of the most smart and knowledgeable personalities in the bitcoin community. Sure it's going to take some time to watch a good number of his videos, but trust me when I say it's very worth it. Best of luck.
Yes, Andreas is the one I followed as well when I started my bitcoin journey. Well respected, holds prior management position to different organization and one of the most sought consultant. For reference I will put his official twitter as well, https://twitter.com/aantonop, and of course his youtube channel: https://www.youtube.com/user/aantonop. Most of the videos are long but definitely worth to watch. Goodluck.