Um, actually that would have been Gamaliel, the teacher of Saul of Tarsus. Not actually the best, but the most well known.
It's ok. Have a cup of coffee, that will perk your brain up.
John 3:10
Jesus answered and said to him,
Thou art the teacher of Israel--and these things thou dost not know!
quoting YLT here because it is literal - - Jesus uses grammar indicating Nicodemus is not 'a' teacher, but specifically 'the' teacher of Israel.
Gamaliel had perhaps the most famous, well regarded school, slightly different kind of notereity.