In 1949, his brother Stanley had also taken an Honours Degree in Philosophy from the same university and in 1953 had passed into the Ceylon Foreign Service, within which he held several senior diplomatic positions and retired in 1988 as Sri Lanka's Ambassador to Germany.
Among the posts he held while serving the Sri Lankan Government between 1955 and 1972 were: In 1974, accepting an invitation from the World Association of Christian Communication (WACC) in London to work as their Director of Research and Planning, Jayaweera relocated to London with his wife Trixie and daughter Mano and served in that capacity till 1989.
He resigned from the WACC in 1989, and resumed his career with the Government of Sri Lanka in 1990, serving as: In addition to his formal employment, Jayaweera held a number of other positions between 1975 and 1991, including: During 1975 and 1989 Jayaweera travelled the globe lecturing on New Communication Technologies and the Communication Revolution, subjects on which he has written extensively.
Jayaweera has also written extensively on Sri Lanka’s ethnic conflict and on spiritual matters.
After his final retirement in 1994, Jayaweera settled down with his wife Trixie in a village in Kent, UK, where he led a contemplative life, meditating, praying and writing on spiritual subjects.