Some of David’s presentations at the American Society for Horticultural Science have been highlighted in the RHA newsletter in the past.
http://txspace.tamu.edu/bitstream/1969.1/4450/1/etd-tamu-2005B-HORT-Shupert.pdf
Link: txspace.tamu.edu/bitstream/1969.1/4450/1/etd-tamu-2005B-HORT-Shupert.pdf