New Bolton Center Kennett Square, PA
Emergencies & Appointments:
Ryan Hospital Philadelphia, PA


Diplomate, American College of Zoological Medicine

Wildlife Veterinary Liaison, Wildlife Futures, University of Pennsylvania School of Veterinary Medicine

Research Areas: wildlife diseases, wildlife epidemiology, wildlife veterinary medicine
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Multiple research projects on free-ranging wildlife including anesthesia,
epidemiology, diagnostics, telemetry implantation.
Clinical assessment and treatment of infertility in a greater one-horned rhinoceros.
Cutaneous vitiligo associated with hypovitaminosis D in Malayan flying foxes (Pteropus vampyrus) and Island flying foxes (Pteropus hypomelanus.
Tuberculosis surveillance of elephants (Elephas maximus) in Nepal at the captive-wild interface.
Other wildlife projects include endangered riparian brush rabbit recovery program, and field projects in Madagascar, Alaska, and other locations. (br>Studies of tuberculosis and chronic wasting disease (CWD) surveillance in free-ranging elk and mule deer.

Led the Denver Zoo Veterinary Medicine and Nutrition Departments, including three staff veterinarians, five veterinary technicians, and a nutritionist in order to providing medical, surgical, and nutritional care for a collection of approximately 3000 animals. Oversaw all animal health care at the institution, including quarantine, preventive medicine, surgery, anesthesia, pathology, and nutrition. Led veterinary program in field conservation with work in Mongolia and the southwestern U.S., with a focus on wildlife livestock disease transmission.

Sauther, M. L., Bertolini, F., Dollar, L. J., Pomerantz, J., Alves, P. C., Gandolfi, B., Kurushima, J. D., Mattucci, F., Randi, E., Rothschild, M. F., Cuozzo, F. P., Larsen, R. S., Moresco, A., Lyons, L. A., Jacky, I. A. Y. Taxonomic identification of Madagascar''s free-ranging "forest cats" 21: 443-451, 2020.

Stringer, Elizabeth, Han, Sushan, Larsen, R Scott Cutaneous vitiligo associated with hypovitaminosis D in Malayan flying foxes (Pteropus vampyrus) and Island flying foxes (Pteropus hypomelanus) Veterinary Record Case Reports 4: e000297, 2016.

Mikota, S. K., Gairhe, K., Giri, K., Hamilton, K., Miller, M., Paudel, S., Lyashchenko, K., Larsen, R. S., Payeur, J. B., Waters, W. R., Greenwald, R., Dumonceaux, G., Vincent, B., Kaufman, G. E. Tuberculosis surveillance of elephants (Elephas maximus) in Nepal at the captive-wild interface European Journal of Wildlife Research 61: 221-229, 2015.

Hurley-Sanders, J. L., Larsen, R. S., Troan, B., Loomis, M. Fungal Osteomyelitis in Two Bufflehead Ducklings (Bucephala Albeola) 46: 613-616, 2015.

Schmitz, K. M., Foley, J. E., Kasten, R. W., Chomel, B. B., Larsen, R. S. Prevalence of Vector-borne Bacterial Pathogens in Riparian Brush Rabbits (Sylvilagus bachmani riparius) and their Ticks 50: 369-373, 2014.

De la Cruz, S. E. W., Takekawa, J. Y., Spragens, K. A., Yee, J., Golightly, R. T., Massey, G., Henkel, L. A., Larsen, R. S., Ziccardi, M. Post-release survival of surf scoters following an oil spill: An experimental approach to evaluating rehabilitation success 67: 100-106, 2013.

Singleton, C., Wack, R., Larsen, R. S. Bacteriologic and Nutritional Evaluation of a Commercial Raw Meat Diet as Part of a Raw Meat Safety Program 31: 574-585, 2012.

Phair, K. A., Larsen, R. S., Wack, R. F., Shilo-Benjamini, Y., Pypendop, B. H. Determination of the minimum anesthetic concentration of sevoflurane in thick-billed parrots (Rhynchopsitta pachyrhyncha) 73: 1350-1355, 2012.

Moresco, Anneke, Larsen, R Scott, Sauther, Michelle L, Cuozzo, Frank P, Jacky, AI Youssouf, Millette, James B Survival of a wild ring-tailed lemur (Lemur catta) with abdominal trauma in an anthropogenically disturbed habitat Madagascar Conservation & Development 7: 49-52, 2012.

Courtot, K. N., Roby, D. D., Adkins, J. Y., Lyons, D. E., King, D. T., Larsen, R. S. Colony connectivity of Pacific Coast double-crested cormorants based on post-breeding dispersal from the region''s largest colony 76: 1462-1471, 2012.

Burgdorf-Moisuk, A., Wack, R., Ziccardi, M., Larsen, R. S., Hopper, K. Validation of Lactate Measurement in American Flamingo (Phoenicopterus Ruber) Plasma and Correlation with Duration and Difficulty of Capture 43: 450-458, 2012.

DVM (Veterinary Medicine) Colorado State University, 1995

MSc (Clinical Sciences, Epidemiology) Colorado State University, 1999

Diplomate, American College of Zoological Medicine