Here is a list of the best cybersecurity experts in the world:
Brian Krebs, Bruce Schneier, Kevin Mitnick, Troy Hunt, Graham Cluley, Joseph Steinberg, Daniel Miessler, Dave Lewis, Zack Whittaker, Jayson Street, etc.
If you plan to get certified in cybersecurity then I would recommend you to take up the Cyber Security Certification from Intellipaat which offers you instructor-led course of 30hrs with 60hrs for projects and exercises.
Also, check out our YouTube video on How to Become a Cyber Security Expert in 2021, to get a better understanding.