Who taught the apostle Paul?

AnswerActs 22:3 says that Paul was brought up in Jerusalem and educated by Gamaliel I the Elder, who flourished in Jerusalem around. 20-50 CE. However, Raymond E. Brown (An Introduction to the New Testament) says this probably needs qualification. The epistles of Paul do not suggest that Paul had seen Jesus during the public ministry or at the crucifixion, and so implicitly cast doubt on Paul's continuous presence in Jerusalem in the years 26-30/33.