1. Collection Manager, Section of Vertebrate Paleontology, Carnegie Museum of Natural History 4400 Forbes Avenue, Pittsburgh, Pennsylvania 15213
2. Curator Emeritus, Section of Vertebrate Paleontology, Carnegie Museum of Natural History 4400 Forbes Avenue, Pittsburgh, Pennsylvania 15213
3. [Research Associate, Section of Vertebrate Paleontology, Carnegie Museum of Natural History] Department of Biology, California State University, San Bernardino, San Bernardino, California 92407
4. [Research Associate, Section of Vertebrate Paleontology, Carnegie Museum of Natural History] Department of Integrative Anatomical Sciences, University of Southern California, Los Angeles, California 90033