in botany at the University of Malaya under Richard Eric Holttum, and following his graduation in 1956 he began working at the Singapore Botanic Gardens.
[2] A year later he went to the United Kingdom on a Singapore government fellowship to pursue a Ph.D. at the University of Cambridge, where his advisor was E. J. H. Corner.
[4] He became the director and ex officio chairman of the Board of Trustees of the Singapore Botanic Gardens in 1969 following the retirement of H. M.
[5] He resigned the following year and moved to Australia to work at the Royal Botanic Garden, Sydney, and was succeeded as director by A. G.
[7] In 1975 he resigned from his post at the National Herbarium of New South Wales to take up a position with the International Union for Conservation of Nature in Morges, Switzerland.