Anders Ericsson
The researcher known as the 'father of the 10,000-hour rule,' though he disliked the moniker and later added caveats to his work, specifying its applicability to 'kind' learning environments.
Videos Mentioning Anders Ericsson

#96–David Epstein: How range of experience leads to better performance in a highly specialized world
Peter Attia MD
A prominent researcher on expertise, whose work, particularly the 10,000-hour study on violinists, is discussed and critically examined for its lack of reported variance and the 'monotonic benefits assumption.'

The No.1 Productivity Expert: 10,000 Hours Is A Lie! This Morning Habit Is Ruining Your Day!
The Diary Of A CEO
The researcher known as the 'father of the 10,000-hour rule,' though he disliked the moniker and later added caveats to his work, specifying its applicability to 'kind' learning environments.

How to Enhance Focus and Improve Productivity | Dr. Cal Newport
Andrew Huberman
Researcher known for his work on deliberate practice, which emphasizes focused, effortful training outside of one's comfort zone to improve skills.

Ep. 234: Ambition Without Burnout
Cal Newport
Author of 'The Road to Excellence,' a book on deliberate practice that Cal Newport previously recommended via Amazon affiliate links on his blog.