At whose feet was Paul educated in Jerusalem, as he told the crowd in Acts 22?

Answer: Gamaliel

Paul said he was born in Tarsus but raised in Jerusalem and educated at the feet of Gamaliel in strict conformity to the law.

““I am a Jew, born in Tarsus of Cilicia, but raised in this city. I was educated at the feet of Gamaliel in strict conformity to the law of our fathers. I was just as zealous for God as any of you are today.”— Acts 22:3 (BSB)