He led the Maya ICGB project, a bioprospecting consortium, supported by the Biodiversity Program for the National Institutes of Health, which was closed in 2001 after accusations of failure to obtain adequate informed consent from the Maya community from which he obtained indigenous knowledge. These allegations were primarily driven by a Canadian-based political activist organization, known at the time as RAFI.
He was elected a Fellow of the American Academy of Arts and Sciences in 1981.