After graduating from Thammasat University Faculty of Law with an honours degree, Judge Phattarasak spent his first three years teaching at his alma mater. In 1984, he moved to become a judge and later held several prominent positions within the judiciary, including Secretary-General to the President of the Supreme Court and Chief Justice of the Central Intellectual Property and International Trade Court. In 2013, he was appointed as Secretary-General of the Office of Judiciary overseeing the entire administrative affairs of the Court of Justice. Judge Phattarasak has maintained his close tie with Thammasat University Faculty of Law where he teaches a number of courses as an adjunct professor.
Judge Phattarasak holds an LL.B. and LL.M. degree from Thammasat and another LL.M. degree from Temple University.