鄧楨1969年喺格雷律師學院攞咗大律師資格。1970年喺香港攞大律師資格。1984年、1986年再喺澳州維多利亞省同美國紐約州擺埋大律師執業資格。1986年獲委任御用大律師。1992年，新加坡認可佢做大律師。
Tang Zhen was admitted to the Bar at Gray's Bar School in 1969. He was admitted to the Hong Kong Bar in 1970. In 1984 and 1986, he was admitted to the Bar in Victoria, Australia and New York, United States. He was appointed Queen's Counsel in 1986. In 1992, Singapore recognized him as a barrister.