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• President of the International Plant Growth Substance Association (1973-1976)

• Flintoff Medal, Royal Society of Chemistry (1978)

• Elected Corresponding Member of the American Society of Plant Physiology (1978)

• Elected Fellow of the Royal Society (1978)

• Research Medal, International Plant Growth Substance Association (1982)

• Elected Distinguished Foreign Scholar of Mid-America Association of State Universities (1987)

• Elected Honorary Member of the Japanese Society for Chemical Regulation in Plants (1987)

• American Society of Plant Physiology, Charles Reid Barnes Award (1988)

• Royal Society of Chemistry Award in Natural Product Chemistry (1988)

• Royal Society of Chemistry Hugo-Muller Lecturership and Medal (1988-1989)

• Elected Honorary Member of the Botanical Society of America (1989)

• Wilson Baker Lecturer, University of Bristol (1990)

• Foreign Associate of the US National Academy of Sciences (1991)

• Pergamon Phytochemical Prize (1995)