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|Ambassador to Italy|
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He was born to W. P. Arnolis Appu of Tangalle, Hemantha, a businessman who owned a large transport business. Warnakulasuriya was educated at the Royal College, Colombo where he launched a handwritten newspaper titled Hela Bima. His classmate at the time was Indika Gunawardena. He took over his father's business after the latter's death, becoming the President of All Ceylon Lorry Owners Association at age 19. During this time he became a patron of the arts and produced several drama productions and a Sinhala film.
He thereafter entered the Colombo Law College and set up Law Students Trust to help needy students.
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He took oaths as an attorney at law in 1972 and began his practice at the Colombo Magistrate's courts. He became Secretary of the New Courts Law Chambers (now known as the Colombo Magistrate's Court Lawyers Association). He was appointed convener of the Professional Affairs Committee, which drafted the "Code of Conduct and Etiquette for Attorneys-at-Law.
In 1989 he was elected Secretary of the Bar Association and served as chairman of the Legal Aid Commission for ten years. He had been elected as Deputy President of Bar Association.
The same year he was appointed as Sri Lanka's Ambassador to Italy.