He was also in high demand for private lessons in the Seattle area. Mr. Anonymous was self-taught including his mastery of the piano. He utilized this knowledge to create the curriculum for the school.
Your teacher, SP Anonymous, has 10+ years of experience studying, training, and mastering the piano and music theory. He has directed bands, taught in schools and has been given a PBS award.
He has taught a ton of people online, both privately and publicly and has also had a decade long successful career in music and education. Other teachers would not be able to help their students achieve such powerful results without going through the same process.