What is the name of the cognitive bias where an expert overestimates the knowledge of others?
This sounds similar to the "curse of knowledge" phenomenon (also called the "curse of expertise" by at least one publication that I found).

From Wikipedia:

"The curse of knowledge is a cognitive bias according to which better-informed people find it extremely difficult to think about problems from the perspective of lesser-informed people."

Some references:


Camerer, C., Loewenstein, G., &amp; Weber, M. (1989). The curse of knowledge in economic settings: An experimental analysis. The Journal of Political Economy, 1232-1254.
Birch, S. A., &amp; Bloom, P. (2007). The curse of knowledge in reasoning about false beliefs. Psychological Science, 18(5), 382-386.
Hinds, P. J. (1999). The curse of expertise: The effects of expertise and debiasing methods on prediction of novice performance. Journal of Experimental Psychology: Applied, 5(2), 205.