He was on the Board of Trustees of Royal Botanic Gardens, Kew, from 1983 to 1993. He is on the Board of Directors of Lawes Agricultural Trust Company and is a foreign fellow of the National Academy of Agricultural Sciences.
- "Archived copy". Archived from the original on 2012-08-26. Retrieved 2011-12-05.CS1 maint: archived copy as title (link)
- "Foreign Fellow". National Academy of Agricultural Sciences. 2016. Retrieved May 6, 2016.