My grandfather was a teacher and in the 50s he started noting that trouble learning to read/write wasn’t linked to lack of intelligence. He started groups for k

My grandfather was a teacher and in the 50s he started noting that trouble learning to read/write wasn’t linked to lack of intelligence. He started groups for kids (mostly guys) with what we now call dyslexia and tried to help them. He had to invent material and methods. On his eightieth birthday some of his students, now in their 50s, told how they had always felt stupid until he showed them they were not. Now they had businesses and successful careers.