Exhibit preparator Denver Museum of Natural History, 1970-1972, curator zoological collections, 1972-1981, curator of zoology, since 1982. Trustee Webb-Waring Lung Institute, Denver, since 1990. Member steering committee Colorado Breeding Bird Atlas, Denver, since 1989, chairperson symposium Perspectives in Urban Ecology, 1990.
Co-principal investigator Documentation and Interpretation of Selected Wildlife Habitat Relationships at the Rocky Mtn. Arsenal; chairperson Documentation subcommittee, since 1991.
Co-founder Foothills Nature Center, Boulder, Colorado, 1984. Nominal partner Colorado Urban Wildlife Partnership, Denver, since 1988. Member American Ornithologists Union, Association Systematics Collections (representative), Colorado chapter The Wildlife Society, Society for the Preservation of Natural History Collections (conservation committee since 1989), American Association Museum (curators committee since 1990), Mountain Plains Museum Association, Colorado Field Ornithologists (vice president 1981-1983), Boulder Audubon Society (treasurer 1975-1977), Cooper Ornithological Society.