Participant in the Workshop on Meiofauna from Chemosynthetic Deep-sea Environments. The Census of Marine Life project ChEss (Biogeography of Deep-Water Chemosynthetic Ecosystems), Ghent, Belgium.
Thistle, D. (2008). Participant in the International Workshop on Barcoding of Deep-Sea Organisms, German Centre for Marine Biodiversity Research. Senckenberg Research Institute, Wilhelmshaven, Germany.
Thistle, D. (2006). Participant in the Workshop on Continental Margin Ecosystems. "COMARGE", a component of the Census of Marine Life, Paris, France.
Thistle, D. (1997). Presenter at the Workshop on Environmental Effects of Deep-Water Oil and Gas Exploration and Exploitation. Minerals Management Service, Department of Commerce.
Thistle, D. (1995). Presenter, Workshop on the Potential Environmental Impact of Deep-Sea Polymetallic Nodule Mining. National Oceanic and Atmospheric Administration.
Thistle, D. (1994). Participant, Workshop on Biological Diversity in Marine Systems. Ocean Studies Board, National Academy of Science.
Thistle, D. (1981). Committee Member. Executive Committee, High Energy Benthic Boundary Layer Experiment, Office of Naval Research.