Vandergert was educated at the Royal College Colombo where he won the Governor-General"s prize. He then pursued higher studies at the University of Ceylon graduating with Bachelor of Laws and qualified as an Advocate of the Supreme Court at the Colombo Law College. Later would gain a master"s degree in Law from the New York University, specializing in International Public Law.
He had served as Sri Lankan High Commissioner of Canada and Ambassador to People's Republic of China & Soviet Union. In 1960 he was selected to the Ceylon Overseas Service. After joining the Foreign Service he served in several foreign countries that included United States, Pakistan.
Within the foreign ministry he served in several capacities including that of Legal Advisor to the Ministry of Foreign Affairs, Director United Nations & Multi Lateral Affairs Division and Director-General Political Affairs.
He served as Sri Lanka"s High Commissioner in Canada, Ambassador to the former Soviet Union and Ambassador to the People"s Republic of China. Thereafter he was appointed to the post of Permanent Secretary of the Ministry of Foreign Affairs (known as Foreign Secretary) as the country"s most senior diplomat in 1994.
At the time he was the second career diplomat to be appointed to this post till then After retiring from the foreign service, he served as Chairman of the Public Service Commission from 2002 to 2005 and was a visiting lecturer in International Law at the Law Faculty.
He died in May 2009.
He was honorary member of the Dutch Burgher Union of Ceylon.
