About Us

VetPath Services is an independent veterinary pathology laboratory located in the Mid-Hudson Valley area, in Stone Ridge, New York. Our goal is to provide you with superior quality histology and cytology services in an expeditious and accurate manner for the well-being of your patients.

Our pathologists have extensive expertise in diagnostic pathology including cytology and histopathology, musculoskeeltal pathology, dermatopathology, and more. 


James Walberg, DVM DACVP

Founder & Head Pathologist

Our head of pathology department at VetPath Services, Dr. Walberg is a board certified anatomical pathologist with extensive experience in cytology. He has in excess of 25 years of experience with commercial veterinary laboratories as well as well-recognized institutions including Angell Memorial Animal Hospital in Boston, Post-Doctoral Fellow at Rockefeller University, The Animal Medical Center in New York City, College of Veterinary Medicine Texas A&M University, College Station, TX., The Bronx Zoo, and recently with Animal Pathology Group (formerly Pal-Path). Dr. Walberg is resident at our facility in Stone Ridge and oversees the preparation of the samples together with our technicians.

Brian G. Caserto, DVM DACVP

Veterinary Pathologist

Dr. Caserto is board-certified in anatomic pathology, and has extensive experience in musculoskeletal, oral/dental, and sinonasal diseases of small and large animals. A New York State native, Dr. Caserto completed a DVM from Cornell University in 2007, and became board certified in Anatomic Pathology in 2010 after completing a residency at Kansas State University.  Dr. Caserto spent 4 years as a lecturer in anatomic pathology at Cornell University College of Veterinary Medicine, in the Department of Biomedical Sciences.  Dr. Caserto’s interests have led to investigations into diagnostic methods of metabolic bone diseases, canine rhabdomyosarcomas, and equine racing injuries. He led the diagnostic investigations in NYS racing injuries for NYRA, and was a member of the Equine Safety Review Board for two years. Dr Caserto spent time in Brisbane, Australia reading cytology and histopathology cases for IDEXX and joined VetPath Services in 2015.

Dr Caserto has collaborated with multiple specialists around New York State in investigations focusing on correlating MRI findings to histological lesions of canine and equine joints and tendons. 


Rivas VN, Magdesian KG, Fagan S, Slovis NM, Luethy D, Javsicas LH, Caserto BG, Miller AD, Dahlgren AR, Peterson J, Hale E, Sichong P, Watson KD, Khokha MK, Finno CJ. A nonsense variant in Rap Guanine Nucleotide Exchange Factor 5 (RAPGEF5) is associated with idiopathic hypocalcemia in Thoroughbred foals. Submitted to PLOS genetics Jan 2020.

Pownder S; Caserto BG; Bowker R; Lin B; Potter H, Koff M. Quantitative Magnetic Resonance Imaging and Histologic Assessment of the Hoof Wall of 3 Year Old Quarter Horses" Equine Veterinary Journal Accepted Oct 2019

Pownder SL, Caserto BG, Hayashi K, Normal ML, Potter HG, Koff MF. Magnetic resonance imaging and histological features of the supraspinatus tendon in nonlame dogs. Am J Vet Res. 2018 79(8): 836-844

Sarah L. Pownder Kei Hayashi Brian G. CasertoRyan E. Breighner Mary L. Norman Hollis G. Potter Matthew F. Koff. Quantitative Magnetic Resonance Imaging and Histological Comparison of Normal Canine Menisci. Vet Comp Orthop Traumatol.2018 31(6) 452-457  DOI https://doi.org/ 10.1055/s-0038-1668115

Pownder SL, et al.  Magnetic Resonance Imaging T2 Values of Stifle Articular Cartilage in Normal Beagles. Veterinary and Comparative Orthopaedics and Traumatology 2018 Feb;31(2) 108-113

Eunju Choi, Sara E. Childs-Sanford, Noha Abou-Madi, Erin E. King, Brian G. Caserto, Heather Priest et al. Hepatic osteodystrophy in a golden lion tamarin (Leontopithecus rosalia). Journal of Zoo and Wildlife Medicine 09/2016; 47(3):907-911.

Kawabata A, Del PieroF, Caserto, BG et al. Metastatic Leiomyosarcoma Causing Ataxia in a Horse. Journal of Equine Veterinary Science 43 April 2016 DOI: 10.1016/j.jevs.2016.04.009

Rosenblatt AJ, Scrivani PV, Caserto BG et al. Imaging diagnosis-meningoencephalitis secondary to suppurative rhinitis and meningoencephalocele infection in a dog. Veterinary Radiology & Ultrasound 55(6) · September 2013 DOI: 10.1111/vru.12105

Caserto BG. A Comparative Review of Canine and Human Rhabdomyosarcoma With Emphasis on Classification and Pathogenesis. Vet Pathol. 2013. 50(5): 806-826

Paul Greenlee, DVM PhD DACVP

Contracting Pathologist

Dr Greenlee is one of two experienced contracting pathologists who work remotely reading cytology and histopathology cases.

Jeanine Peters-Kennedy, DVM, Diplomate ACVP, ACVD

Veterinary Pathologist and Dermatologist (Consultant)

Dr. Peters-Kennedy is board-certified in anatomic pathology and dermatology. She is a practicing veterinary dermatologist with expertise in dermatopathology. Dr. Peters-Kennedy recently co-authored the integumentary system chapter in the new 2015 edition of Pathology of Domestic Animals.

Our Team

Joshua Smirin

Managing Director

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