After joining the Foreign Service he served in India, Germany, Pakistan and Bangladesh before being appointed Ambassador to Yugoslavia (1986–1991) where he was the Dean of the Diplomatic Corps. Thereafter he was posted as ambassador to the People’s Republic of China (1993–1997) with concurrent accreditation as ambassador to Mongolia. Having served as director of various divisions and a Director General in the Foreign Ministry, he was appointed to the post of Permanent Secretary of the Ministry of Foreign Affairs (known as Foreign Secretary) in 1997 and held the post till 1999, in this capacity he served as the head of the Foreign Service.[1]
In 1999 he was sent as Sri Lanka’s ambassador in Italy and the Holy See and was concurrently ambassador to Greece and high commissioner to Cyprus and Malta. During his tenure he had been Sri Lanka’s accredited permanent representative to the UN’s Food and Agriculture Organization (FAO), the World Food Programme (WFP), and the International Fund for Agricultural Development (IFAD) and had served as the chairman of the Group of 77 (G77) Conference as chairman of the Rome Chapter from 1999 to 2002. In 2003 upon his return after completing his tenure, he retired from the Foreign Service. Wilhelm would serve as president of the Dutch Burgher Union of Ceylon until suffering from a debilitating stroke and tragic death with his loving wife Desiree Frederick Rita Hills at his bedside. For those who were fortunate to have the rare honor to have known Wilhelm would know what it was to bask in his generosity, compassion and enjoy his intellectual wit. He is fondly remembered and forever missed.
