Thomas S. Schulenberg is a research associate at the Cornell Laboratory of Ornithology. Douglas F. Stotz is an ornithologist and conservation ecologist at the Field Museum in Chicago. Daniel F. Lane and John P. O'Neill are illustrators and field ornithologists, and both are research associates at the Louisiana State University Museum of Natural Science. Lane also leads Field Guides birding tours. Theodore A. Parker III, who worked throughout Peru before his death in 1993, was the premier neotropical field ornithologist of his time.