Wait! If this is the first time you've ever heard of Barkley, you MUST drop what you are doing and read one of the highest cited and most impactful papers in the field of psychology. According to google, it's been cited nearly 12000 times with only about half of those being Barkley citing himself
😛.
Honestly, a couple of passes at it is worthy. It's amazing that it's nearly 30 years old, and appears to be standing the test of time.
this:
https://frisch-ot.com/wp-content/uploads/2021/11/EFModelBarkely.pdf
In the language of the kids, they would say that Russell Barkley is OP (overpowered). Super nice guy, pretty responsive dude via email. Absolute legend. It's hard to convey how much he's done for the field. Comparable to Einstein, Pope, etc. He is S tier.
He was one of the major player at looking at ADHD as a life course altering impairment - that extends into adulthood. Prolific researcher and his parent management program is something I reach for a lot, especially with oppositionality is present.